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Electron configuration

Electron configuration

Electron configuration

In atomic physics and quantum chemistry, electron configuration is the arrangement of electrons of an atom, a molecule, or other physical structure...

s of the neutral gaseous atoms in the ground state. Given by subshells in concise form, by subshells written out, and by number of electrons per shell.

Legend
1s	2s	2p	3s	3p	3d	4s	4p	4d	4f	5s	5p	5d	5f	6s	6p	6d	7s	7p
1 H hydrogen Hydrogen Hydrogen is the chemical element with atomic number 1. It is represented by the symbol H. With an average atomic weight of , hydrogen is the lightest and most abundant chemical element, constituting roughly 75% of the Universe's chemical elemental mass. Stars in the main sequence are mainly...  : 1s1
1s1
1
2 He helium Helium Helium is the chemical element with atomic number 2 and an atomic weight of 4.002602, which is represented by the symbol He. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas that heads the noble gas group in the periodic table...  : 1s2
1s2
2
3 Li lithium Lithium Lithium is a soft, silver-white metal that belongs to the alkali metal group of chemical elements. It is represented by the symbol Li, and it has the atomic number 3. Under standard conditions it is the lightest metal and the least dense solid element. Like all alkali metals, lithium is highly...  : 1s2 2s1
1s2	2s1
2	1
4 Be beryllium Beryllium Beryllium is the chemical element with the symbol Be and atomic number 4. It is a divalent element which occurs naturally only in combination with other elements in minerals. Notable gemstones which contain beryllium include beryl and chrysoberyl...  : 1s2 2s2
1s2	2s2
2	2
5 B boron Boron Boron is the chemical element with atomic number 5 and the chemical symbol B. Boron is a metalloid. Because boron is not produced by stellar nucleosynthesis, it is a low-abundance element in both the solar system and the Earth's crust. However, boron is concentrated on Earth by the...  : 1s2 2s2 2p1
1s2	2s2	2p1
2	3
6 C carbon Carbon Carbon is the chemical element with symbol C and atomic number 6. As a member of group 14 on the periodic table, it is nonmetallic and tetravalent—making four electrons available to form covalent chemical bonds...  : 1s2 2s2 2p2
1s2	2s2	2p2
2	4
7 N nitrogen Nitrogen Nitrogen is a chemical element that has the symbol N, atomic number of 7 and atomic mass 14.00674 u. Elemental nitrogen is a colorless, odorless, tasteless, and mostly inert diatomic gas at standard conditions, constituting 78.08% by volume of Earth's atmosphere...  : 1s2 2s2 2p3
1s2	2s2	2p3
2	5
8 O oxygen Oxygen Oxygen is the element with atomic number 8 and represented by the symbol O. Its name derives from the Greek roots ὀξύς and -γενής , because at the time of naming, it was mistakenly thought that all acids required oxygen in their composition...  : 1s2 2s2 2p4
1s2	2s2	2p4
2	6
9 F fluorine Fluorine Fluorine is the chemical element with atomic number 9, represented by the symbol F. It is the lightest element of the halogen column of the periodic table and has a single stable isotope, fluorine-19. At standard pressure and temperature, fluorine is a pale yellow gas composed of diatomic...  : 1s2 2s2 2p5
1s2	2s2	2p5
2	7
10 Ne neon Neon Neon is the chemical element that has the symbol Ne and an atomic number of 10. Although a very common element in the universe, it is rare on Earth. A colorless, inert noble gas under standard conditions, neon gives a distinct reddish-orange glow when used in either low-voltage neon glow lamps or...  : 1s2 2s2 2p6
1s2	2s2	2p6
2	8
11 Na sodium Sodium Sodium is a chemical element with the symbol Na and atomic number 11. It is a soft, silvery-white, highly reactive metal and is a member of the alkali metals; its only stable isotope is 23Na. It is an abundant element that exists in numerous minerals, most commonly as sodium chloride...  : [Ne] 3s1
1s2	2s2	2p6	3s1
2	8		1
12 Mg magnesium Magnesium Magnesium is a chemical element with the symbol Mg, atomic number 12, and common oxidation number +2. It is an alkaline earth metal and the eighth most abundant element in the Earth's crust and ninth in the known universe as a whole...  : [Ne] 3s2
1s2	2s2	2p6	3s2
2	8		2
13 Al aluminium Aluminium Aluminium or aluminum is a silvery white member of the boron group of chemical elements. It has the symbol Al, and its atomic number is 13. It is not soluble in water under normal circumstances....  : [Ne] 3s2 3p1
1s2	2s2	2p6	3s2	3p1
2	8		3
14 Si silicon Silicon Silicon is a chemical element with the symbol Si and atomic number 14. A tetravalent metalloid, it is less reactive than its chemical analog carbon, the nonmetal directly above it in the periodic table, but more reactive than germanium, the metalloid directly below it in the table...  : [Ne] 3s2 3p2
1s2	2s2	2p6	3s2	3p2
2	8		4
15 P phosphorus Phosphorus Phosphorus is the chemical element that has the symbol P and atomic number 15. A multivalent nonmetal of the nitrogen group, phosphorus as a mineral is almost always present in its maximally oxidized state, as inorganic phosphate rocks...  : [Ne] 3s2 3p3
1s2	2s2	2p6	3s2	3p3
2	8		5
16 S sulfur Sulfur Sulfur or sulphur is the chemical element with atomic number 16. In the periodic table it is represented by the symbol S. It is an abundant, multivalent non-metal. Under normal conditions, sulfur atoms form cyclic octatomic molecules with chemical formula S8. Elemental sulfur is a bright yellow...  : [Ne] 3s2 3p4
1s2	2s2	2p6	3s2	3p4
2	8		6
17 Cl chlorine Chlorine Chlorine is the chemical element with atomic number 17 and symbol Cl. It is the second lightest halogen, found in the periodic table in group 17. The element forms diatomic molecules under standard conditions, called dichlorine...  : [Ne] 3s2 3p5
1s2	2s2	2p6	3s2	3p5
2	8		7
18 Ar argon Argon Argon is a chemical element represented by the symbol Ar. Argon has atomic number 18 and is the third element in group 18 of the periodic table . Argon is the third most common gas in the Earth's atmosphere, at 0.93%, making it more common than carbon dioxide...  : [Ne] 3s2 3p6
1s2	2s2	2p6	3s2	3p6
2	8		8
19 K potassium Potassium Potassium is the chemical element with the symbol K and atomic number 19. Elemental potassium is a soft silvery-white alkali metal that oxidizes rapidly in air and is very reactive with water, generating sufficient heat to ignite the hydrogen emitted in the reaction.Potassium and sodium are...  : [Ar] 4s1
1s2	2s2	2p6	3s2	3p6		4s1
2	8		8			1
20 Ca calcium Calcium Calcium is the chemical element with the symbol Ca and atomic number 20. It has an atomic mass of 40.078 amu. Calcium is a soft gray alkaline earth metal, and is the fifth-most-abundant element by mass in the Earth's crust...  : [Ar] 4s2
1s2	2s2	2p6	3s2	3p6		4s2
2	8		8			2
21 Sc scandium Scandium Scandium is a chemical element with symbol Sc and atomic number 21. A silvery-white metallic transition metal, it has historically been sometimes classified as a rare earth element, together with yttrium and the lanthanoids...  : [Ar] 3d1 4s2
1s2	2s2	2p6	3s2	3p6	3d1	4s2
2	8		9			2
22 Ti titanium Titanium Titanium is a chemical element with the symbol Ti and atomic number 22. It has a low density and is a strong, lustrous, corrosion-resistant transition metal with a silver color....  : [Ar] 3d2 4s2
1s2	2s2	2p6	3s2	3p6	3d2	4s2
2	8		10			2
23 V vanadium Vanadium Vanadium is a chemical element with the symbol V and atomic number 23. It is a hard, silvery gray, ductile and malleable transition metal. The formation of an oxide layer stabilizes the metal against oxidation. The element is found only in chemically combined form in nature...  : [Ar] 3d3 4s2
1s2	2s2	2p6	3s2	3p6	3d3	4s2
2	8		11			2
24 Cr chromium Chromium Chromium is a chemical element which has the symbol Cr and atomic number 24. It is the first element in Group 6. It is a steely-gray, lustrous, hard metal that takes a high polish and has a high melting point. It is also odorless, tasteless, and malleable...  : [Ar] 3d5 4s1
1s2	2s2	2p6	3s2	3p6	3d5	4s1
2	8		13			1
25 Mn manganese Manganese Manganese is a chemical element, designated by the symbol Mn. It has the atomic number 25. It is found as a free element in nature , and in many minerals...  : [Ar] 3d5 4s2
1s2	2s2	2p6	3s2	3p6	3d5	4s2
2	8		13			2
26 Fe iron Iron Iron is a chemical element with the symbol Fe and atomic number 26. It is a metal in the first transition series. It is the most common element forming the planet Earth as a whole, forming much of Earth's outer and inner core. It is the fourth most common element in the Earth's crust...  : [Ar] 3d6 4s2
1s2	2s2	2p6	3s2	3p6	3d6	4s2
2	8		14			2
27 Co cobalt Cobalt Cobalt is a chemical element with symbol Co and atomic number 27. It is found naturally only in chemically combined form. The free element, produced by reductive smelting, is a hard, lustrous, silver-gray metal....  : [Ar] 3d7 4s2
1s2	2s2	2p6	3s2	3p6	3d7	4s2
2	8		15			2
28 Ni nickel Nickel Nickel is a chemical element with the chemical symbol Ni and atomic number 28. It is a silvery-white lustrous metal with a slight golden tinge. Nickel belongs to the transition metals and is hard and ductile...  : [Ar] 3d8 4s2
1s2	2s2	2p6	3s2	3p6	3d8	4s2
2	8		16			2
29 Cu copper Copper Copper is a chemical element with the symbol Cu and atomic number 29. It is a ductile metal with very high thermal and electrical conductivity. Pure copper is soft and malleable; an exposed surface has a reddish-orange tarnish...  : [Ar] 3d10 4s1
1s2	2s2	2p6	3s2	3p6	3d10	4s1
2	8		18			1
30 Zn zinc Zinc Zinc , or spelter , is a metallic chemical element; it has the symbol Zn and atomic number 30. It is the first element in group 12 of the periodic table. Zinc is, in some respects, chemically similar to magnesium, because its ion is of similar size and its only common oxidation state is +2...  : [Ar] 3d10 4s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2
2	8		18			2
31 Ga gallium Gallium Gallium is a chemical element that has the symbol Ga and atomic number 31. Elemental gallium does not occur in nature, but as the gallium salt in trace amounts in bauxite and zinc ores. A soft silvery metallic poor metal, elemental gallium is a brittle solid at low temperatures. As it liquefies...  : [Ar] 3d10 4s2 4p1
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p1
2	8		18			3
32 Ge germanium Germanium Germanium is a chemical element with the symbol Ge and atomic number 32. It is a lustrous, hard, grayish-white metalloid in the carbon group, chemically similar to its group neighbors tin and silicon. The isolated element is a semiconductor, with an appearance most similar to elemental silicon....  : [Ar] 3d10 4s2 4p2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p2
2	8		18			4
33 As arsenic Arsenic Arsenic is a chemical element with the symbol As, atomic number 33 and relative atomic mass 74.92. Arsenic occurs in many minerals, usually in conjunction with sulfur and metals, and also as a pure elemental crystal. It was first documented by Albertus Magnus in 1250.Arsenic is a metalloid...  : [Ar] 3d10 4s2 4p3
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p3
2	8		18			5
34 Se selenium Selenium Selenium is a chemical element with atomic number 34, chemical symbol Se, and an atomic mass of 78.96. It is a nonmetal, whose properties are intermediate between those of adjacent chalcogen elements sulfur and tellurium...  : [Ar] 3d10 4s2 4p4
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p4
2	8		18			6
35 Br bromine Bromine Bromine ") is a chemical element with the symbol Br, an atomic number of 35, and an atomic mass of 79.904. It is in the halogen element group. The element was isolated independently by two chemists, Carl Jacob Löwig and Antoine Jerome Balard, in 1825–1826...  : [Ar] 3d10 4s2 4p5
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p5
2	8		18			7
36 Kr krypton Krypton Krypton is a chemical element with the symbol Kr and atomic number 36. It is a member of Group 18 and Period 4 elements. A colorless, odorless, tasteless noble gas, krypton occurs in trace amounts in the atmosphere, is isolated by fractionally distilling liquified air, and is often used with other...  : [Ar] 3d10 4s2 4p6
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6
2	8		18			8
37 Rb rubidium Rubidium Rubidium is a chemical element with the symbol Rb and atomic number 37. Rubidium is a soft, silvery-white metallic element of the alkali metal group. Its atomic mass is 85.4678. Elemental rubidium is highly reactive, with properties similar to those of other elements in group 1, such as very rapid...  : [Kr] 5s1
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6			5s1
2	8		18			8				1
38 Sr strontium Strontium Strontium is a chemical element with the symbol Sr and the atomic number 38. An alkaline earth metal, strontium is a soft silver-white or yellowish metallic element that is highly reactive chemically. The metal turns yellow when exposed to air. It occurs naturally in the minerals celestine and...  : [Kr] 5s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6			5s2
2	8		18			8				2
39 Y yttrium Yttrium Yttrium is a chemical element with symbol Y and atomic number 39. It is a silvery-metallic transition metal chemically similar to the lanthanides and it has often been classified as a "rare earth element". Yttrium is almost always found combined with the lanthanides in rare earth minerals and is...  : [Kr] 4d1 5s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d1		5s2
2	8		18			9				2
40 Zr zirconium Zirconium Zirconium is a chemical element with the symbol Zr and atomic number 40. The name of zirconium is taken from the mineral zircon. Its atomic mass is 91.224. It is a lustrous, grey-white, strong transition metal that resembles titanium...  : [Kr] 4d2 5s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d2		5s2
2	8		18			10				2
41 Nb niobium Niobium Niobium or columbium , is a chemical element with the symbol Nb and atomic number 41. It's a soft, grey, ductile transition metal, which is often found in the pyrochlore mineral, the main commercial source for niobium, and columbite...  : [Kr] 4d4 5s1
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d4		5s1
2	8		18			12				1
42 Mo molybdenum Molybdenum Molybdenum , is a Group 6 chemical element with the symbol Mo and atomic number 42. The name is from Neo-Latin Molybdaenum, from Ancient Greek , meaning lead, itself proposed as a loanword from Anatolian Luvian and Lydian languages, since its ores were confused with lead ores...  : [Kr] 4d5 5s1
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d5		5s1
2	8		18			13				1
43 Tc technetium Technetium Technetium is the chemical element with atomic number 43 and symbol Tc. It is the lowest atomic number element without any stable isotopes; every form of it is radioactive. Nearly all technetium is produced synthetically and only minute amounts are found in nature...  : [Kr] 4d5 5s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d5		5s2
2	8		18			13				2
44 Ru ruthenium Ruthenium Ruthenium is a chemical element with symbol Ru and atomic number 44. It is a rare transition metal belonging to the platinum group of the periodic table. Like the other metals of the platinum group, ruthenium is inert to most chemicals. The Russian scientist Karl Ernst Claus discovered the element...  : [Kr] 4d7 5s1
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d7		5s1
2	8		18			15				1
45 Rh rhodium Rhodium Rhodium is a chemical element that is a rare, silvery-white, hard and chemically inert transition metal and a member of the platinum group. It has the chemical symbol Rh and atomic number 45. It is composed of only one isotope, 103Rh. Naturally occurring rhodium is found as the free metal, alloyed...  : [Kr] 4d8 5s1
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d8		5s1
2	8		18			16				1
46 Pd palladium Palladium Palladium is a chemical element with the chemical symbol Pd and an atomic number of 46. It is a rare and lustrous silvery-white metal discovered in 1803 by William Hyde Wollaston. He named it after the asteroid Pallas, which was itself named after the epithet of the Greek goddess Athena, acquired...  : [Kr] 4d10
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10
2	8		18			18
47 Ag silver Silver Silver is a metallic chemical element with the chemical symbol Ag and atomic number 47. A soft, white, lustrous transition metal, it has the highest electrical conductivity of any element and the highest thermal conductivity of any metal...  : [Kr] 4d10 5s1
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10		5s1
2	8		18			18				1
48 Cd cadmium Cadmium Cadmium is a chemical element with the symbol Cd and atomic number 48. This soft, bluish-white metal is chemically similar to the two other stable metals in group 12, zinc and mercury. Similar to zinc, it prefers oxidation state +2 in most of its compounds and similar to mercury it shows a low...  : [Kr] 4d10 5s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10		5s2
2	8		18			18				2
49 In indium Indium Indium is a chemical element with the symbol In and atomic number 49. This rare, very soft, malleable and easily fusible post-transition metal is chemically similar to gallium and thallium, and shows the intermediate properties between these two...  : [Kr] 4d10 5s2 5p1
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10		5s2	5p1
2	8		18			18				3
50 Sn tin Tin Tin is a chemical element with the symbol Sn and atomic number 50. It is a main group metal in group 14 of the periodic table. Tin shows chemical similarity to both neighboring group 14 elements, germanium and lead and has two possible oxidation states, +2 and the slightly more stable +4...  : [Kr] 4d10 5s2 5p2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10		5s2	5p2
2	8		18			18				4
51 Sb antimony Antimony Antimony is a toxic chemical element with the symbol Sb and an atomic number of 51. A lustrous grey metalloid, it is found in nature mainly as the sulfide mineral stibnite...  : [Kr] 4d10 5s2 5p3
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10		5s2	5p3
2	8		18			18				5
52 Te tellurium : [Kr] 4d10 5s2 5p4
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10		5s2	5p4
53 I iodine Iodine Iodine is a chemical element with the symbol I and atomic number 53. The name is pronounced , , or . The name is from the , meaning violet or purple, due to the color of elemental iodine vapor....  : [Kr] 4d10 5s2 5p5
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10		5s2	5p5
2	8		18			18				7
54 Xe xenon Xenon Xenon is a chemical element with the symbol Xe and atomic number 54. The element name is pronounced or . A colorless, heavy, odorless noble gas, xenon occurs in the Earth's atmosphere in trace amounts...  : [Kr] 4d10 5s2 5p6
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10		5s2	5p6
2	8		18			18				8
55 Cs caesium Caesium Caesium or cesium is the chemical element with the symbol Cs and atomic number 55. It is a soft, silvery-gold alkali metal with a melting point of 28 °C , which makes it one of only five elemental metals that are liquid at room temperature...  : [Xe] 6s1
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10		5s2	5p6			6s1
2	8		18			18				8				1
56 Ba barium Barium Barium is a chemical element with the symbol Ba and atomic number 56. It is the fifth element in Group 2, a soft silvery metallic alkaline earth metal. Barium is never found in nature in its pure form due to its reactivity with air. Its oxide is historically known as baryta but it reacts with...  : [Xe] 6s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10		5s2	5p6			6s2
2	8		18			18				8				2
57 La lanthanum Lanthanum Lanthanum is a chemical element with the symbol La and atomic number 57.Lanthanum is a silvery white metallic element that belongs to group 3 of the periodic table and is the first element of the lanthanide series. It is found in some rare-earth minerals, usually in combination with cerium and...  : [Xe] 5d1 6s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10		5s2	5p6	5d1		6s2
2	8		18			18				9				2
58 Ce cerium Cerium Cerium is a chemical element with the symbol Ce and atomic number 58. It is a soft, silvery, ductile metal which easily oxidizes in air. Cerium was named after the dwarf planet . Cerium is the most abundant of the rare earth elements, making up about 0.0046% of the Earth's crust by weight...  : [Xe] 4f1 5d1 6s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f1	5s2	5p6	5d1		6s2
2	8		18			19				9				2
59 Pr praseodymium Praseodymium Praseodymium is a chemical element that has the symbol Pr and atomic number 59. Praseodymium is a soft, silvery, malleable and ductile metal in the lanthanide group. It is too reactive to be found in native form, and when artificially prepared, it slowly develops a green oxide coating.The element...  : [Xe] 4f3 6s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f3	5s2	5p6			6s2
2	8		18			21				8				2
60 Nd neodymium Neodymium Neodymium is a chemical element with the symbol Nd and atomic number 60. It is a soft silvery metal that tarnishes in air. Neodymium was discovered in 1885 by the Austrian chemist Carl Auer von Welsbach. It is present in significant quantities in the ore minerals monazite and bastnäsite...  : [Xe] 4f4 6s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f4	5s2	5p6			6s2
2	8		18			22				8				2
61 Pm promethium Promethium Promethium is a chemical element with the symbol Pm and atomic number 61. It is notable for being the only exclusively radioactive element besides technetium that is followed by chemical elements with stable isotopes.- Prediction :...  : [Xe] 4f5 6s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f5	5s2	5p6			6s2
2	8		18			23				8				2
62 Sm samarium Samarium Samarium is a chemical element with the symbol Sm, atomic number 62 and atomic weight 150.36. It is a moderately hard silvery metal which readily oxidizes in air. Being a typical member of the lanthanide series, samarium usually assumes the oxidation state +3...  : [Xe] 4f6 6s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f6	5s2	5p6			6s2
2	8		18			24				8				2
63 Eu europium Europium Europium is a chemical element with the symbol Eu and atomic number 63. It is named after the continent of Europe. It is a moderately hard silvery metal which readily oxidizes in air and water...  : [Xe] 4f7 6s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f7	5s2	5p6			6s2
2	8		18			25				8				2
64 Gd gadolinium Gadolinium Gadolinium is a chemical element with the symbol Gd and atomic number 64. It is a silvery-white, malleable and ductile rare-earth metal. It is found in nature only in combined form. Gadolinium was first detected spectroscopically in 1880 by de Marignac who separated its oxide and is credited with...  : [Xe] 4f7 5d1 6s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f7	5s2	5p6	5d1		6s2
2	8		18			25				9				2
65 Tb terbium Terbium Terbium is a chemical element with the symbol Tb and atomic number 65. It is a silvery-white rare earth metal that is malleable, ductile and soft enough to be cut with a knife...  : [Xe] 4f9 6s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f9	5s2	5p6			6s2
2	8		18			27				8				2
66 Dy dysprosium Dysprosium Dysprosium is a chemical element with the symbol Dy and atomic number 66. It is a rare earth element with a metallic silver luster. Dysprosium is never found in nature as a free element, though it is found in various minerals, such as xenotime...  : [Xe] 4f10 6s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f10	5s2	5p6			6s2
2	8		18			28				8				2
67 Ho holmium Holmium Holmium is a chemical element with the symbol Ho and atomic number 67. Part of the lanthanide series, holmium is a rare earth element. Its oxide was first isolated from rare earth ores in 1878 and the element was named after the city of Stockholm....  : [Xe] 4f11 6s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f11	5s2	5p6			6s2
2	8		18			29				8				2
68 Er erbium Erbium Erbium is a chemical element in the lanthanide series, with the symbol Er and atomic number 68. A silvery-white solid metal when artificially isolated, natural erbium is always found in chemical combination with other elements on Earth...  : [Xe] 4f12 6s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f12	5s2	5p6			6s2
2	8		18			30				8				2
69 Tm thulium Thulium Thulium is a chemical element that has the symbol Tm and atomic number 69. Thulium is the second least abundant of the lanthanides . It is an easily workable metal with a bright silvery-gray luster...  : [Xe] 4f13 6s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f13	5s2	5p6			6s2
2	8		18			31				8				2
70 Yb ytterbium Ytterbium Ytterbium is a chemical element with the symbol Yb and atomic number 70. A soft silvery metallic element, ytterbium is a rare earth element of the lanthanide series and is found in the minerals gadolinite, monazite, and xenotime. The element is sometimes associated with yttrium or other related...  : [Xe] 4f14 6s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f14	5s2	5p6			6s2
2	8		18			32				8				2
71 Lu lutetium : [Xe] 4f14 5d1 6s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f14	5s2	5p6	5d1		6s2
2	8		18			32				9				2
72 Hf hafnium Hafnium Hafnium is a chemical element with the symbol Hf and atomic number 72. A lustrous, silvery gray, tetravalent transition metal, hafnium chemically resembles zirconium and is found in zirconium minerals. Its existence was predicted by Dmitri Mendeleev in 1869. Hafnium was the penultimate stable...  : [Xe] 4f14 5d2 6s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f14	5s2	5p6	5d2		6s2
2	8		18			32				10				2
73 Ta tantalum Tantalum Tantalum is a chemical element with the symbol Ta and atomic number 73. Previously known as tantalium, the name comes from Tantalus, a character in Greek mythology. Tantalum is a rare, hard, blue-gray, lustrous transition metal that is highly corrosion resistant. It is part of the refractory...  : [Xe] 4f14 5d3 6s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f14	5s2	5p6	5d3		6s2
2	8		18			32				11				2
74 W tungsten Tungsten Tungsten , also known as wolfram , is a chemical element with the chemical symbol W and atomic number 74.A hard, rare metal under standard conditions when uncombined, tungsten is found naturally on Earth only in chemical compounds. It was identified as a new element in 1781, and first isolated as...  : [Xe] 4f14 5d4 6s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f14	5s2	5p6	5d4		6s2
2	8		18			32				12				2
75 Re rhenium Rhenium Rhenium is a chemical element with the symbol Re and atomic number 75. It is a silvery-white, heavy, third-row transition metal in group 7 of the periodic table. With an average concentration of 1 part per billion , rhenium is one of the rarest elements in the Earth's crust. The free element has...  : [Xe] 4f14 5d5 6s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f14	5s2	5p6	5d5		6s2
2	8		18			32				13				2
76 Os osmium Osmium Osmium is a chemical element with the symbol Os and atomic number 76. Osmium is a hard, brittle, blue-gray or blue-blacktransition metal in the platinum family, and is the densest natural element. Osmium is twice as dense as lead. The density of osmium is , slightly greater than that of iridium,...  : [Xe] 4f14 5d6 6s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f14	5s2	5p6	5d6		6s2
2	8		18			32				14				2
77 Ir iridium Iridium Iridium is the chemical element with atomic number 77, and is represented by the symbol Ir. A very hard, brittle, silvery-white transition metal of the platinum family, iridium is the second-densest element and is the most corrosion-resistant metal, even at temperatures as high as 2000 °C...  : [Xe] 4f14 5d7 6s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f14	5s2	5p6	5d7		6s2
2	8		18			32				15				2
78 Pt platinum Platinum Platinum is a chemical element with the chemical symbol Pt and an atomic number of 78. Its name is derived from the Spanish term platina del Pinto, which is literally translated into "little silver of the Pinto River." It is a dense, malleable, ductile, precious, gray-white transition metal...  : [Xe] 4f14 5d9 6s1
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f14	5s2	5p6	5d9		6s1
2	8		18			32				17				1
79 Au gold Gold Gold is a chemical element with the symbol Au and an atomic number of 79. Gold is a dense, soft, shiny, malleable and ductile metal. Pure gold has a bright yellow color and luster traditionally considered attractive, which it maintains without oxidizing in air or water. Chemically, gold is a...  : [Xe] 4f14 5d10 6s1
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f14	5s2	5p6	5d10		6s1
2	8		18			32				18				1
80 Hg mercury Mercury (element) Mercury is a chemical element with the symbol Hg and atomic number 80. It is also known as quicksilver or hydrargyrum...  : [Xe] 4f14 5d10 6s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f14	5s2	5p6	5d10		6s2
2	8		18			32				18				2
81 Tl thallium Thallium Thallium is a chemical element with the symbol Tl and atomic number 81. This soft gray poor metal resembles tin but discolors when exposed to air. The two chemists William Crookes and Claude-Auguste Lamy discovered thallium independently in 1861 by the newly developed method of flame spectroscopy...  : [Xe] 4f14 5d10 6s2 6p1
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f14	5s2	5p6	5d10		6s2	6p1
2	8		18			32				18				3
82 Pb lead Lead Lead is a main-group element in the carbon group with the symbol Pb and atomic number 82. Lead is a soft, malleable poor metal. It is also counted as one of the heavy metals. Metallic lead has a bluish-white color after being freshly cut, but it soon tarnishes to a dull grayish color when exposed...  : [Xe] 4f14 5d10 6s2 6p2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f14	5s2	5p6	5d10		6s2	6p2
2	8		18			32				18				4
83 Bi bismuth Bismuth Bismuth is a chemical element with symbol Bi and atomic number 83. Bismuth, a trivalent poor metal, chemically resembles arsenic and antimony. Elemental bismuth may occur naturally uncombined, although its sulfide and oxide form important commercial ores. The free element is 86% as dense as lead...  : [Xe] 4f14 5d10 6s2 6p3
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f14	5s2	5p6	5d10		6s2	6p3
2	8		18			32				18				5
84 Po polonium Polonium Polonium is a chemical element with the symbol Po and atomic number 84, discovered in 1898 by Marie Skłodowska-Curie and Pierre Curie. A rare and highly radioactive element, polonium is chemically similar to bismuth and tellurium, and it occurs in uranium ores. Polonium has been studied for...  : [Xe] 4f14 5d10 6s2 6p4
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f14	5s2	5p6	5d10		6s2	6p4
2	8		18			32				18				6
85 At astatine Astatine Astatine is a radioactive chemical element with the symbol At and atomic number 85. It occurs on the Earth only as the result of decay of heavier elements, and decays away rapidly, so much less is known about this element than its upper neighbors in the periodic table...  : [Xe] 4f14 5d10 6s2 6p5
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f14	5s2	5p6	5d10		6s2	6p5
2	8		18			32				18				7
86 Rn radon Radon Radon is a chemical element with symbol Rn and atomic number 86. It is a radioactive, colorless, odorless, tasteless noble gas, occurring naturally as the decay product of uranium or thorium. Its most stable isotope, 222Rn, has a half-life of 3.8 days...  : [Xe] 4f14 5d10 6s2 6p6
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f14	5s2	5p6	5d10		6s2	6p6
2	8		18			32				18				8
87 Fr francium Francium Francium is a chemical element with symbol Fr and atomic number 87. It was formerly known as eka-caesium and actinium K.Actually the least unstable isotope, francium-223 It has the lowest electronegativity of all known elements, and is the second rarest naturally occurring element...  : [Rn] 7s1
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f14	5s2	5p6	5d10		6s2	6p6		7s1
2	8		18			32				18				8			1
88 Ra radium Radium Radium is a chemical element with atomic number 88, represented by the symbol Ra. Radium is an almost pure-white alkaline earth metal, but it readily oxidizes on exposure to air, becoming black in color. All isotopes of radium are highly radioactive, with the most stable isotope being radium-226,...  : [Rn] 7s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f14	5s2	5p6	5d10		6s2	6p6		7s2
2	8		18			32				18				8			2
89 Ac actinium Actinium Actinium is a radioactive chemical element with the symbol Ac and atomic number 89, which was discovered in 1899. It was the first non-primordial radioactive element to be isolated. Polonium, radium and radon were observed before actinium, but they were not isolated until 1902...  : [Rn] 6d1 7s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f14	5s2	5p6	5d10		6s2	6p6	6d1	7s2
2	8		18			32				18				9			2
90 Th thorium Thorium Thorium is a natural radioactive chemical element with the symbol Th and atomic number 90. It was discovered in 1828 and named after Thor, the Norse god of thunder....  : [Rn] 6d2 7s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f14	5s2	5p6	5d10		6s2	6p6	6d2	7s2
2	8		18			32				18				10			2
91 Pa protactinium Protactinium Protactinium is a chemical element with the symbol Pa and atomic number 91. It is a dense, silvery-gray metal which readily reacts with oxygen, water vapor and inorganic acids. It forms various chemical compounds where protactinium is usually present in the oxidation state +5, but can also assume...  : [Rn] 5f2 6d1 7s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f14	5s2	5p6	5d10	5f2	6s2	6p6	6d1	7s2
2	8		18			32				20				9			2
92 U uranium Uranium Uranium is a silvery-white metallic chemical element in the actinide series of the periodic table, with atomic number 92. It is assigned the chemical symbol U. A uranium atom has 92 protons and 92 electrons, of which 6 are valence electrons...  : [Rn] 5f3 6d1 7s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f14	5s2	5p6	5d10	5f3	6s2	6p6	6d1	7s2
2	8		18			32				21				9			2
93 Np neptunium Neptunium Neptunium is a chemical element with the symbol Np and atomic number 93. A radioactive metal, neptunium is the first transuranic element and belongs to the actinide series. Its most stable isotope, 237Np, is a by-product of nuclear reactors and plutonium production and it can be used as a...  : [Rn] 5f4 6d1 7s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f14	5s2	5p6	5d10	5f4	6s2	6p6	6d1	7s2
2	8		18			32				22				9			2
94 Pu plutonium Plutonium Plutonium is a transuranic radioactive chemical element with the chemical symbol Pu and atomic number 94. It is an actinide metal of silvery-gray appearance that tarnishes when exposed to air, forming a dull coating when oxidized. The element normally exhibits six allotropes and four oxidation...  : [Rn] 5f6 7s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f14	5s2	5p6	5d10	5f6	6s2	6p6		7s2
2	8		18			32				24				8			2
95 Am americium Americium Americium is a synthetic element that has the symbol Am and atomic number 95. This transuranic element of the actinide series is located in the periodic table below the lanthanide element europium, and thus by analogy was named after another continent, America.Americium was first produced in 1944...  : [Rn] 5f7 7s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f14	5s2	5p6	5d10	5f7	6s2	6p6		7s2
2	8		18			32				25				8			2
96 Cm curium Curium Curium is a synthetic chemical element with the symbol Cm and atomic number 96. This radioactive transuranic element of the actinide series was named after Marie Skłodowska-Curie and her husband Pierre Curie. Curium was first intentionally produced and identified in summer 1944 by the group of...  : [Rn] 5f7 6d1 7s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f14	5s2	5p6	5d10	5f7	6s2	6p6	6d1	7s2
2	8		18			32				25				9			2
97 Bk berkelium Berkelium Berkelium , is a synthetic element with the symbol Bk and atomic number 97, a member of the actinide and transuranium element series. It is named after the city of Berkeley, California, the location of the University of California Radiation Laboratory where it was discovered in December 1949...  : [Rn] 5f9 7s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f14	5s2	5p6	5d10	5f9	6s2	6p6		7s2
2	8		18			32				27				8			2
98 Cf californium Californium Californium is a radioactive metallic chemical element with the symbol Cf and atomic number 98. The element was first made in the laboratory in 1950 by bombarding curium with alpha particles at the University of California, Berkeley. It is the ninth member of the actinide series and was the...  : [Rn] 5f10 7s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f14	5s2	5p6	5d10	5f10	6s2	6p6		7s2
2	8		18			32				28				8			2
99 Es einsteinium Einsteinium Einsteinium is a synthetic element with the symbol Es and atomic number 99. It is the seventh transuranic element, and an actinide.Einsteinium was discovered in the debris of the first hydrogen bomb explosion in 1952, and named after Albert Einstein...  : [Rn] 5f11 7s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f14	5s2	5p6	5d10	5f11	6s2	6p6		7s2
2	8		18			32				29				8			2
100 Fm fermium Fermium Fermium is a synthetic element with the symbol Fm. It is the 100th element in the periodic table and a member of the actinide series. It is the heaviest element that can be formed by neutron bombardment of lighter elements, and hence the last element that can be prepared in macroscopic quantities,...  : [Rn] 5f12 7s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f14	5s2	5p6	5d10	5f12	6s2	6p6		7s2
2	8		18			32				30				8			2
101 Md mendelevium Mendelevium Mendelevium is a synthetic element with the symbol Md and the atomic number 101. A metallic radioactive transuranic element in the actinide series, mendelevium is usually synthesized by bombarding einsteinium with alpha particles. It was named after Dmitri Ivanovich Mendeleev, who created the...  : [Rn] 5f13 7s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f14	5s2	5p6	5d10	5f13	6s2	6p6		7s2
2	8		18			32				31				8			2
102 No nobelium Nobelium Nobelium is a synthetic element with the symbol No and atomic number 102. It was first correctly identified in 1966 by scientists at the Flerov Laboratory of Nuclear Reactions in Dubna, Soviet Union...  : [Rn] 5f14 7s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f14	5s2	5p6	5d10	5f14	6s2	6p6		7s2
2	8		18			32				32				8			2
103 Lr lawrencium Lawrencium Lawrencium is a radioactive synthetic chemical element with the symbol Lr and atomic number 103. In the periodic table of the elements, it is a period 7 d-block element and the last element of actinide series...  : probably [Rn] 5f14 7s2 7p1
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f14	5s2	5p6	5d10	5f14	6s2	6p6		7s2	7p1
2	8		18			32				32				8			3
104 Rf rutherfordium Rutherfordium Rutherfordium is a chemical element with symbol Rf and atomic number 104, named in honor of New Zealand physicist Ernest Rutherford. It is a synthetic element and radioactive; the most stable known isotope, 267Rf, has a half-life of approximately 1.3 hours.In the periodic table of the elements,...  : probably [Rn] 5f14 6d2 7s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f14	5s2	5p6	5d10	5f14	6s2	6p6	6d2	7s2
2	8		18			32				32				10			2
105 Db dubnium Dubnium The Soviet team proposed the name nielsbohrium in honor of the Danish nuclear physicist Niels Bohr. The American team proposed that the new element should be named hahnium , in honor of the late German chemist Otto Hahn...  : probably [Rn] 5f14 6d3 7s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f14	5s2	5p6	5d10	5f14	6s2	6p6	6d3	7s2
2	8		18			32				32				11			2
106 Sg seaborgium Seaborgium Seaborgium is a synthetic chemical element with the symbol Sg and atomic number 106.Seaborgium is a synthetic element whose most stable isotope 271Sg has a half-life of 1.9 minutes. A new isotope 269Sg has a potentially slightly longer half-life based on the observation of a single decay...  : probably [Rn] 5f14 6d4 7s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f14	5s2	5p6	5d10	5f14	6s2	6p6	6d4	7s2
2	8		18			32				32				12			2
107 Bh bohrium Bohrium Bohrium is a chemical element with the symbol Bh and atomic number 107 and is the heaviest member of group 7 .It is a synthetic element whose most stable known isotope, 270Bh, has a half-life of 61 seconds...  : probably [Rn] 5f14 6d5 7s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f14	5s2	5p6	5d10	5f14	6s2	6p6	6d5	7s2
2	8		18			32				32				13			2
108 Hs hassium Hassium Hassium is a synthetic element with the symbol Hs and atomic number 108. It is the heaviest member of the group 8 elements. The element was first observed in 1984...  : probably [Rn] 5f14 6d6 7s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f14	5s2	5p6	5d10	5f14	6s2	6p6	6d6	7s2
2	8		18			32				32				14			2
109 Mt meitnerium Meitnerium Meitnerium is a chemical element with the symbol Mt and atomic number 109. It is placed as the heaviest member of group 9 in the periodic table but a sufficiently stable isotope is not known at this time which would allow chemical experiments to confirm its position, unlike its lighter...  : probably [Rn] 5f14 6d7 7s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f14	5s2	5p6	5d10	5f14	6s2	6p6	6d7	7s2
2	8		18			32				32				15			2
110 Ds darmstadtium Darmstadtium Darmstadtium is a chemical element with the symbol Ds and atomic number 110. It is placed as the heaviest member of group 10, but no known isotope is sufficiently stable to allow chemical experiments to confirm its placing in that group...  : probably [Rn] 5f14 6d9 7s1
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f14	5s2	5p6	5d10	5f14	6s2	6p6	6d9	7s1
2	8		18			32				32				17			1
111 Rg roentgenium Roentgenium Roentgenium is a synthetic radioactive chemical element with the symbol Rg and atomic number 111. It is placed as the heaviest member of the group 11 elements, although a sufficiently stable isotope has not yet been produced in a sufficient amount that would confirm this position as a heavier...  : probably [Rn] 5f14 6d9 7s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f14	5s2	5p6	5d10	5f14	6s2	6p6	6d9	7s2
2	8		18			32				32				17			2
112 Cn copernicium : probably [Rn] 5f14 6d10 7s2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f14	5s2	5p6	5d10	5f14	6s2	6p6	6d10	7s2
2	8		18			32				32				18			2
113 Uut ununtrium Ununtrium Ununtrium is the temporary name of a synthetic element with the temporary symbol Uut and atomic number 113.It is placed as the heaviest member of the group 13 elements although a sufficiently stable isotope is not known at this time that would allow chemical experiments to confirm its position...  : probably [Rn] 5f14 6d10 7s2 7p1
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f14	5s2	5p6	5d10	5f14	6s2	6p6	6d10	7s2	7p1
2	8		18			32				32				18			3
114 Uuq ununquadium Ununquadium Ununquadium is the temporary name of a radioactive chemical element with the temporary symbol Uuq and atomic number 114. There is no proposed name yet, although flerovium has been discussed in the media.About 80 decays of atoms of...  : probably [Rn] 5f14 6d10 7s2 7p2
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f14	5s2	5p6	5d10	5f14	6s2	6p6	6d10	7s2	7p2
2	8		18			32				32				18			4
115 Uup ununpentium Ununpentium Ununpentium is the temporary name of a synthetic superheavy element in the periodic table that has the temporary symbol Uup and has the atomic number 115....  : probably [Rn] 5f14 6d10 7s2 7p3
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f14	5s2	5p6	5d10	5f14	6s2	6p6	6d10	7s2	7p3
2	8		18			32				32				18			5
116 Uuh ununhexium Ununhexium Ununhexium is the temporary name of a synthetic superheavy element with the temporary symbol Uuh and atomic number 116. There is no proposed name yet although moscovium has been discussed in the media.It is placed as the heaviest member of group 16 although a sufficiently stable isotope is...  : probably [Rn] 5f14 6d10 7s2 7p4
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f14	5s2	5p6	5d10	5f14	6s2	6p6	6d10	7s2	7p4
2	8		18			32				32				18			6
117 Uus ununseptium Ununseptium Ununseptium is the temporary name of a superheavy artificial chemical element with temporary symbol Uus and atomic number 117. Six atoms were detected by a joint Russia–US collaboration at Dubna, Moscow Oblast, Russia, in 2009–10...  : probably [Rn] 5f14 6d10 7s2 7p5
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f14	5s2	5p6	5d10	5f14	6s2	6p6	6d10	7s2	7p5
2	8		18			32				32				18			7
118 Uuo ununoctium Ununoctium Ununoctium is the temporary IUPAC name for the transactinide element having the atomic number 118 and temporary element symbol Uuo. It is also known as eka-radon or element 118, and on the periodic table of the elements it is a p-block element and the last one of the 7th period. Ununoctium is... : probably [Rn] 5f14 6d10 7s2 7p6
1s2	2s2	2p6	3s2	3p6	3d10	4s2	4p6	4d10	4f14	5s2	5p6	5d10	5f14	6s2	6p6	6d10	7s2	7p6
2	8		18			32				32				18			8

NIST

• http://physics.nist.gov/PhysRefData/IonEnergy/ionEnergy.html ; retrieved July 2005, (elements 1–104) based on:
  • Atomic Spectroscopy, by W.C. Martin and W.L. Wiese in Atomic, Molecular, & Optical Physics Handbook, ed. by G.W.F. Drake (AIP, Woodbury, NY, 1996) Chapter 10, pp. 135–153.

This website is also cited in the CRC Handbook as source of Section 1, subsection Electron Configuration of Neutral Atoms in the Ground State.

• 91 Pa : [Rn] 5f²(³H₄) 6d 7s²
• 92 U : [Rn] 5f³(⁴I^o_9/2) 6d 7s²
• 93 Np : [Rn] 5f⁴(⁵I₄) 6d 7s²
• 103 Lr : [Rn] 5f¹⁴ 7s² 7p¹ question-marked
• 104 Rf : [Rn] 5f¹⁴ 6d² 7s² question-marked

CRC

• David R. Lide (ed), CRC Handbook of Chemistry and Physics, 84th Edition, online version. CRC Press. Boca Raton, Florida, 2003; Section 1, Basic Constants, Units, and Conversion Factors; Electron Configuration of Neutral Atoms in the Ground State. (elements 1–104)
• Also subsection Periodic Table of the Elements, (elements 1–103) based on:
  • G. J. Leigh, Editor, Nomenclature of Inorganic Chemistry, Blackwell Scientific Publications, Oxford, 1990.
  • Chemical and Engineering News, 63(5), 27, 1985.
  • Atomic Weights of the Elements, 1999, Pure & Appl. Chem., 73, 667, 2001.

WebElements

• http://www.webelements.com/ ; retrieved July 2005, electron configurations based on:
  • Atomic, Molecular, & Optical Physics Handbook, Ed. Gordon W. F. Drake, American Institute of Physics, Woodbury, New York, USA, 1996.
  • J.E. Huheey, E.A. Keiter, and R.L. Keiter in Inorganic Chemistry : Principles of Structure and Reactivity, 4th edition, HarperCollins, New York, USA, 1993.
  • R.L. DeKock and H.B. Gray in Chemical Structure and bonding, Benjamin/Cummings, Menlo Park, California, USA, 1980.
  • A.M. James and M.P. Lord in Macmillan's Chemical and Physical Data, Macmillan, London, UK, 1992.

• 103 Lr : [Rn].5f¹⁴.7s².7p¹ tentative ; 2.8.18.32.32.9.2 [inconsistent]
• 104 Rf : [Rn].5f¹⁴.6d².7s² tentative
• 105 Db : [Rn].5f¹⁴.6d³.7s² (a guess based upon that of tantalum) ; 2.8.18.32.32.11.2
• 106 Sg : [Rn].5f¹⁴.6d⁴.7s² (a guess based upon that of tungsten) ; 2.8.18.32.32.12.2
• 107 Bh : [Rn].5f¹⁴.6d⁵.7s² (a guess based upon that of rhenium) ; 2.8.18.32.32.13.2
• 108 Hs : [Rn].5f¹⁴.6d⁶.7s² (a guess based upon that of osmium) ; 2.8.18.32.32.14.2
• 109 Mt : [Rn].5f¹⁴.6d⁷.7s² (a guess based upon that of iridium) ; 2.8.18.32.32.15.2
• 110 Ds : [Rn].5f¹⁴.6d⁹.7s¹ (a guess based upon that of platinum) ; 2.8.18.32.32.17.1
• 111 Rg : [Rn].5f¹⁴.6d¹⁰.7s¹ (a guess based upon that of gold) ; 2.8.18.32.32.18.1
• 112 Cn : [Rn].5f¹⁴.6d¹⁰.7s² (a guess based upon that of mercury) ; 2.8.18.32.32.18.2
• 113 Uut : [Rn].5f¹⁴.6d¹⁰.7s².7p¹ (a guess based upon that of thallium) ; 2.8.18.32.32.18.3
• 114 Uuq : [Rn].5f¹⁴.6d¹⁰.7s².7p² (a guess based upon that of lead) ; 2.8.18.32.32.18.4
• 115 Uup : [Rn].5f¹⁴.6d¹⁰.7s².7p³ (a guess based upon that of bismuth) ; 2.8.18.32.32.18.5
• 116 Uuh : [Rn].5f¹⁴.6d¹⁰.7s².7p⁴ (a guess based upon that of polonium) ; 2.8.18.32.32.18.6
• 117 Uus : [Rn].5f¹⁴.6d¹⁰.7s².7p⁵ (a guess based upon that of astatine) ; 2.8.18.32.32.18.7
• 118 Uuo : [Rn].5f¹⁴.6d¹⁰.7s².7p⁶ (a guess based upon that of radon) ; 2.8.18.32.32.18.8

Lange

• J.A. Dean (ed), Lange's Handbook of Chemistry (15th Edition), online version, McGraw-Hill, 1999; Section 4, Table 4.1 Electronic Configuration and Properties of the Elements. (Elements 1–103)

• 97 Bk : [Rn] 5f⁸ 6d 7s²
• 103 Lr : [Rn] 4f¹⁴ [sic] 6d 7s²

Hill and Petrucci

• Hill and Petrucci, General Chemistry: An Integrated Approach (3rd edition), Prentice Hall. (Elements 1–106)

• 58 Ce : [Xe] 4f² 6s²
• 103 Lr : [Rn] 5f¹⁴ 6d¹ 7s²
• 104 Rf : [Rn] 5f¹⁴ 6d² 7s² (agrees with guess above)
• 105 Db : [Rn] 5f¹⁴ 6d³ 7s²
• 106 Sg : [Rn] 5f¹⁴ 6d⁴ 7s²