Isotopes of neon

Neon (Ne)
Standard atomic mass: 20.1797(6) u

[edit] Table

nuclide symbol	Z(p)	N(n)	isotopic mass (u)	half-life	nuclear spin	representative isotopic composition (mole fraction)	range of natural variation (mole fraction)
nuclide symbol	excitation energy			half-life	nuclear spin	representative isotopic composition (mole fraction)	range of natural variation (mole fraction)
¹⁶Ne	10	6	16.025761(22)	9E-21 s [122(37) keV]	0+
¹⁷Ne	10	7	17.017672(29)	109.2(6) ms	1/2-
¹⁸Ne	10	8	18.0057082(3)	1.672(8) s	0+
¹⁹Ne	10	9	19.0018802(3)	17.296(5) s	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	5/2+
²⁴Ne	10	14	23.9936108(4)	3.38(2) min	0+
²⁵Ne	10	15	24.997737(28)	602(8) ms	(3/2)+
²⁶Ne	10	16	26.000461(29)	197(1) ms	0+
²⁷Ne	10	17	27.00759(12)	32(2) ms	(3/2+)#
²⁸Ne	10	18	28.01207(16)	18.3(22) ms	0+
²⁹Ne	10	19	29.01939(29)	15.6(5) ms	(3/2+)#
³⁰Ne	10	20	30.02480(61)	5.8(2) ms	0+
³¹Ne	10	21	31.03311(97)#	3.4(8) ms	7/2-#
³²Ne	10	22	32.04002(86)#	3.5(9) ms	0+
³³Ne	10	23	33.04938(86)#	<260 ns	7/2-#
³⁴Ne	10	24	34.05703(87)#	1# ms [>1.5 µs]	0+

The isotopic composition refers to that in air.
The precision of the isotope abundances and atomic mass is limited through variations. The given ranges should be applicable to any normal terrestrial material.
Geologically exceptional samples are known in which the isotopic composition lies outside the reported range. The uncertainty in the atomic mass may exceed the stated value for such specimens.
Commercially available materials may have been subjected to an undisclosed or inadvertent isotopic fractionation. Substantial deviations from the given mass and composition can occur.
Values marked # are not purely derived from experimental data, but at least partly from systematic trends. Spins with weak assignment arguments are enclosed in parentheses.
Uncertainties are given in concise form in parentheses after the corresponding last digits. Uncertainty values denote one standard deviation, except isotopic composition and standard atomic mass from IUPAC which use expanded uncertainties.

Isotope masses from Ame2003 Atomic Mass Evaluation by G. Audi, A.H. Wapstra, C. Thibault, J. Blachot and O. Bersillon in Nuclear Physics A729 (2003).
Isotopic compositions and standard atomic masses from Atomic weights of the elements. Review 2000 (IUPAC Technical Report). Pure Appl. Chem. Vol. 75, No. 6, pp. 683-800, (2003) and Atomic Weights Revised (2005).
Half-life, spin, and isomer data selected from these sources. Editing notes on this article's talk page.
- Audi, Bersillon, Blachot, Wapstra. The Nubase2003 evaluation of nuclear and decay properties, Nuc. Phys. A 729, pp. 3-128 (2003).
- National Nuclear Data Center, Brookhaven National Laboratory. Information extracted from the NuDat 2.1 database (retrieved Sept. 2005).
- David R. Lide (ed.), Norman E. Holden in CRC Handbook of Chemistry and Physics, 85th Edition, online version. CRC Press. Boca Raton, Florida (2005). Section 11, Table of the Isotopes.