Isotopes of neon

Neon (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)	N(n)	isotopic mass (u)	half-life	decay mode(s)^[1]	daughter isotope(s)^{[n 1]}	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	¹⁴O	0+
¹⁷Ne^{[n 2]}	10	7	17.017672(29)	109.2(6) ms	β⁺, p (96.0%)	¹⁶O	1/2-
					β⁺, α (2.7%)	¹³C
					β⁺ (1.3%)	¹⁷F
¹⁸Ne	10	8	18.0057082(3)	1.672(8) s	Electron capture (EC)	¹⁸F	0+
¹⁸Ne	10	8	18.0057082(3)	1.672(8) s	2p (possibly ²He)^[2]	¹⁶O	0+
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+
²⁶Ne	10	16	26.000461(29)	197(1) ms	β^-, n (.13%)	²⁵Na	0+
²⁷Ne	10	17	27.00759(12)	32(2) ms	β^- (98.0%)	²⁷Na	(3/2+)#
²⁷Ne	10	17	27.00759(12)	32(2) ms	β^-, n (2.0%)	²⁶Na	(3/2+)#
²⁸Ne	10	18	28.01207(16)	18.3(22) ms	β^- (78.0%)	²⁸Na	0+
²⁸Ne	10	18	28.01207(16)	18.3(22) ms	β^-, n (22.0%)	²⁷Na	0+
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-#
³¹Ne	10	21	31.03311(97)#	3.4(8) ms	β^-, n	³⁰Na	7/2-#
³²Ne	10	22	32.04002(86)#	3.5(9) ms	β^-, n	³¹Na	0+
³²Ne	10	22	32.04002(86)#	3.5(9) ms	β^-	³²Na	0+
³³Ne	10	23	33.04938(86)#	<260 ns			7/2-#
³⁴Ne	10	24	34.05703(87)#	1# ms [>1.5 µs]			0+

^ Bold for stable isotopes
^ Has 2 halo protons

Notes

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.

References

Isotope masses from:
- G. Audi, A. H. Wapstra, C. Thibault, J. Blachot and O. Bersillon (2003). "The NUBASE evaluation of nuclear and decay properties". Nuclear Physics A 729: 3–128. Bibcode 2003NuPhA.729....3A. doi:10.1016/j.nuclphysa.2003.11.001. http://www.nndc.bnl.gov/amdc/nubase/Nubase2003.pdf.
Isotopic compositions and standard atomic masses from:
- J. R. de Laeter, J. K. Böhlke, P. De Bièvre, H. Hidaka, H. S. Peiser, K. J. R. Rosman and P. D. P. Taylor (2003). "Atomic weights of the elements. Review 2000 (IUPAC Technical Report)". Pure and Applied Chemistry 75 (6): 683–800. doi:10.1351/pac200375060683. http://www.iupac.org/publications/pac/75/6/0683/pdf/.
- M. E. Wieser (2006). "Atomic weights of the elements 2005 (IUPAC Technical Report)". Pure and Applied Chemistry 78 (11): 2051–2066. doi:10.1351/pac200678112051. http://iupac.org/publications/pac/78/11/2051/pdf/. Lay summary.
Half-life, spin, and isomer data selected from the following sources. See editing notes on this article's talk page.
- G. Audi, A. H. Wapstra, C. Thibault, J. Blachot and O. Bersillon (2003). "The NUBASE evaluation of nuclear and decay properties". Nuclear Physics A 729: 3–128. Bibcode 2003NuPhA.729....3A. doi:10.1016/j.nuclphysa.2003.11.001. http://www.nndc.bnl.gov/amdc/nubase/Nubase2003.pdf.
- National Nuclear Data Center. "NuDat 2.1 database". Brookhaven National Laboratory. http://www.nndc.bnl.gov/nudat2/. Retrieved September 2005.
- N. E. Holden (2004). "Table of the Isotopes". In D. R. Lide. CRC Handbook of Chemistry and Physics (85th ed.). CRC Press. Section 11. ISBN 978-0849304859.

Isotopes of fluorine	Isotopes of neon	Isotopes of sodium
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