A chemical element is a type of atom that is distinguished by its atomic number; that is, by the number of protons in its atomic nucleus. The term is also used to refer to a pure chemical Chemical substance composed of atoms with the same number of protons.... s in the fourth row (or period
Periodic table period
In the periodic table of the Chemical element, a period is a horizontal row of the table. A group, or family, is a vertical column of the table.... ) of the periodic table of the elements
Periodic table
The periodic table of the chemical elements is a table method of displaying the chemical elements. Although precursors to this table exist, its invention is generally credited to Russian chemist Dmitri Mendeleev in 1869.... .
A chemical element is a type of atom that is distinguished by its atomic number; that is, by the number of protons in its atomic nucleus. The term is also used to refer to a pure chemical Chemical substance composed of atoms with the same number of protons.... s in the fourth row (or period
Periodic table period
In the periodic table of the Chemical element, a period is a horizontal row of the table. A group, or family, is a vertical column of the table.... ) of the periodic table of the elements
Periodic table
The periodic table of the chemical elements is a table method of displaying the chemical elements. Although precursors to this table exist, its invention is generally credited to Russian chemist Dmitri Mendeleev in 1869.... .
In chemistry, a group is a vertical column in the periodic table of the chemical elements. The name family is derived from the fact that the elements share similar characteristics and traits, just as members of any human family would....
The alkali metals are a chemical series of chemical elements comprising Periodic table group of the periodic table: lithium , sodium , potassium , rubidium , caesium , and francium ....
The alkaline earth metals are a chemical series of chemical element comprising Periodic table group of the periodic table: beryllium , magnesium , calcium , strontium , barium and radium ....
|-| Period 5 element |||-||| Group number of lanthanides and actinides|-||||-||||-| Period 6 element || *Lanthanides|-| Period 7 element || **Actinides...
In modern IUPAC nomenclature, Group 4 of the periodic table contains the following chemical elements:* titanium * zirconium * hafnium * rutherfordium ....
A Group 5 element is one in the chemical series of Chemical element in periodic table group in the periodic table, which consists of vanadium , niobium , tantalum , and dubnium ....
A Group 6 element is one in the chemical series of Chemical element in periodic table group in the periodic table, which consists of the transition metals chromium , molybdenum , tungsten , and seaborgium ....
A Group 7 element is one in the chemical series of Chemical element in periodic table group in the periodic table, which consists of the transition metals manganese , technetium , rhenium , and bohrium ....
A Group 8 element is one in the chemical series of Chemical element in periodic table group in the periodic table, which consists of the transition metals iron , ruthenium , osmium and hassium ....
In modern IUPAC nomenclature, Group 9 of the periodic table contains the Chemical element cobalt , rhodium , iridium , and meitnerium . These are all d-block transition metals....
A Group 10 element is one in the chemical series of Chemical element in periodic table group 10 in the periodic table, which consists of the transition metals nickel , palladium , platinum , and darmstadtium ....
A Group 11 element is one in the chemical series of Chemical element in periodic table group in the periodic table, consisting of transition metals which are the traditional coinage metals of copper , silver , and gold ....
The boron group is the chemical series of Chemical element in periodic table group in the periodic table. The boron group consists of boron , aluminium , gallium , indium , thallium , and ununtrium ....
The carbon group is group 14 in the periodic table. Once also known as the tetrels , stemming from the earlier naming convention of this group as Group IVA....
The Nitrogen group is periodic table group 15 of the periodic table and is also collectively named the pnictogens. This consists of nitrogen , phosphorus , arsenic , antimony , bismuth and ununpentium ....
The chalcogens are the Chemical element in periodic table group 16 of the periodic table. It is sometimes known as the oxygen family. It consists of the chemical element oxygen , sulfur , selenium , tellurium , the radioactive element polonium , and the synthetic element ununhexium ....
|}The halogens or halogen elements are a chemical series of nonmetal chemical element from Periodic table group International Union of Pure and Applied Chemistry of the periodic table, comprising fluorine, F; chlorine, Cl; bromine, Br; iodine, I; and astatine, At....
|}The noble gases are a group of chemical elements with very similar properties: under standard conditions, they are all odorless, colorless, monatomic gases, with a very low chemical reactivity....
Potassium is a chemical element. It has the symbol K , atomic number 19, and atomic mass 39.0983. Potassium was first isolated from potash, hence the name....
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 grey alkaline earth metal, and is the fifth most abundant element by mass in the earth's Crust ....
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 lanthanides....
Titanium is a chemical element with the symbol Ti and atomic number 22. Sometimes called the ?space age metal?, it has a low density and is a strong, lustrous, corrosion-resistant transition metal with a silver colour....
Vanadium is the chemical element with the symbol V and atomic number 23. It is a soft, silvery grey, ductile transition metal. The formation of an oxide layer stabilizes the metal against oxidation....
Chromium is a chemical element which has the symbol Cr and atomic number 24. It is a steely-gray, Lustre , hard metal that takes a high polish and has a high melting point....
Manganese is a chemical element, designated by the symbol Mn. It has the atomic number 25. It is found as a Oxidation state in nature , and in many minerals....
Iron is a chemical element with the symbol Fe and atomic number 26. Iron is a Group 8 element and period 4 element. Iron is lustrous and silvery in color....
Cobalt is a hard, lustrous, grey metal, a chemical element with symbol Co and atomic number 27. Although cobalt-based colors and pigments have been used since ancient times, and miners have long used the name kobold ore for some minerals, cobalt was only discovered in 1735 by Georg Brandt....
Zinc is a metallic chemical element with the symbol Zn and atomic number 30. It is a first-row transition metal of the group 12 element of the periodic table....
Gallium is a chemical element that has the symbol Ga and atomic number 31. Elemental gallium does not occur in nature, but as the Ga salt, in trace amounts in bauxite and zinc ores....
Germanium is a chemical element with the symbol Ge and atomic number 32. It is a lustrous, hard, greyish-white metalloid in the carbon group, chemically similar to its group neighbors tin and silicon....
Selenium is a chemical element with the atomic number 34, represented by the chemical symbol Se, an atomic mass of 78.96. It is a nonmetal, chemically related to sulfur and tellurium, and rarely occurs in its elemental state in nature....
Bromine , , meaning "stench " ), is a chemical element with the symbol Br and atomic number 35. A halogen element, bromine is a reddish-brown Volatility liquid at Standard conditions for temperature and pressure that is intermediate in reactivity between chlorine and iodine....
KRYPTON is a frame language computer programming language."An Essential Hybrid Reasoning System: Knowledge and Symbol Level Accounts of KRYPTON", R.J. Brachman et al, Proc IJCAI-85, 1985....
