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...

(Ne) possesses three stable isotopes, ²⁰Ne, ²¹Ne, and ²²Ne. In addition, 16 radioactive isotopes have been discovered ranging from ¹⁶Ne to ³⁴Ne, all short-lived. The longest-lived is ²⁴Ne with a half-life of 3.38 minutes. All others are under a minute, most under a second. The least stable is ¹⁶Ne with a half-life of 122 (37) keV. See isotopes of carbon for notes about the measurement.

Standard atomic mass: 20.1797(6) u

Table

nuclide symbol	Z(p Proton The proton is a subatomic particle with the symbol or and a positive electric charge of 1 elementary charge. One or more protons are present in the nucleus of each atom, along with neutrons. The number of protons in each atom is its atomic number.... )	N(n Neutron The neutron is a subatomic hadron particle which has the symbol or , no net electric charge and a mass slightly larger than that of a proton. With the exception of hydrogen, nuclei of atoms consist of protons and neutrons, which are therefore collectively referred to as nucleons. The number of... )	isotopic mass (u)	half-life	decay mode(s)	daughter isotope(s)Bold for stable isotopes	nuclear spin	representative isotopic composition (mole fraction)	range of natural variation (mole fraction)
16Ne	10	6	16.025761(22)	9×10−21 s [122(37) keV]	2p Proton emission Proton emission is a type of radioactive decay in which a proton is ejected from a nucleus. Proton emission can occur from high-lying excited states in a nucleus following a beta decay, in which case the process is known as beta-delayed proton emission, or can occur from the ground state of very...	14O	0+
17NeHas 2 halo protons	10	7	17.017672(29)	109.2(6) ms	β+ Beta decay In nuclear physics, beta decay is a type of radioactive decay in which a beta particle is emitted from an atom. There are two types of beta decay: beta minus and beta plus. In the case of beta decay that produces an electron emission, it is referred to as beta minus , while in the case of a... , p (96.0%)	16O	1/2-
					β+, α Alpha decay Alpha decay is a type of radioactive decay in which an atomic nucleus emits an alpha particle and thereby transforms into an atom with a mass number 4 less and atomic number 2 less...  (2.7%)	13C
					β+ (1.3%)	17F
18Ne	10	8	18.0057082(3)	1.672(8) s	β+	18F	0+
					2p (possibly 2He Diproton A diproton is a hypothetical isotope of helium nucleus consisting of two protons and no neutrons, and is predicted to be less stable than 5He... )	16O
19Ne	10	9	19.0018802(3)	17.296(5) s+	β+	19F	1/2+
20Ne	10	10	19.9924401754(19)	Stable			0+	0.9048(3)	0.8847-0.9051
21Ne	10	11	20.99384668(4)	Stable			3/2+	0.0027(1)	0.0027-0.0171
22Ne	10	12	21.991385114(19)	Stable			0+	0.0925(3)	0.0920-0.0996
23Ne	10	13	22.99446690(11)	37.24(12) s	β-	23Na	5/2+
24Ne	10	14	23.9936108(4)	3.38(2) min	β-	24Na	0+
25Ne	10	15	24.997737(28)	602(8) ms	β-	25Na	(3/2)+
26Ne	10	16	26.000461(29)	197(1) ms	β- (99.87%)	26Na	0+
					β-, n Neutron emission Neutron emission is a type of radioactive decay of atoms containing excess neutrons, in which a neutron is simply ejected from the nucleus. Two examples of isotopes which emit neutrons are helium-5 and beryllium-13... (.13%)	25Na
27Ne	10	17	27.00759(12)	32(2) ms	β- (98.0%)	27Na	(3/2+)#
					β-, n (2.0%)	26Na
28Ne	10	18	28.01207(16)	18.3(22) ms	β- (78.0%)	28Na	0+
					β-, n (22.0%)	27Na
29Ne	10	19	29.01939(29)	15.6(5) ms	β-	29Na	(3/2+)#
30Ne	10	20	30.02480(61)	5.8(2) ms	β-	30Na	0+
31Ne	10	21	31.03311(97)#	3.4(8) ms	β-	31Na	7/2-#
					β-, n	30Na
32Ne	10	22	32.04002(86)#	3.5(9) ms	β-, n	31Na	0+
					β-	32Na
33Ne	10	23	33.04938(86)#	<260 ns			7/2-#
34Ne	10	24	34.05703(87)#	1# ms [>1.5 µs]			0+

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