Isotopes of neon

Neon (₁₀Ne) possesses three stable isotopes, ²⁰Ne, ²¹Ne, and ²²Ne. In addition, 17 radioactive isotopes have been discovered ranging from ¹⁵Ne 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 ¹⁵Ne with a half-life of 7.7×10⁻²² s. See isotopes of carbon for notes about the measurement.

Main isotopes of neon (₁₀Ne)

Iso­tope Decay abun­dance half-life (t1/2) mode pro­duct ^20Ne 90.48% stable ^21Ne 0.27% stable ^22Ne 9.25% stable
Standard atomic weight Ar, standard(Ne)	20.1797(6)[1]

The abundances of the naturally occurring isotopes of neon

List of isotopes

Nuclide[2] [n 1]	Z	N	Isotopic mass (Da)[3] [n 2][n 3]	Half-life [resonance width]	Decay mode [n 4]	Daughter isotope [n 5]	Spin and parity [n 6]	Natural abundance (mole fraction)
	Excitation energy							Normal proportion	Range of variation
^15Ne[4]	10	5	15.04317(7)	7.7(3)×10^−22 s [0.59(23)− 2.522(60) MeV]	2p	^13O	(3/2−)
^16Ne	10	6	16.025751(22)	> 5.7×10^−21 s [122(37) keV]	2p	^14O	0+
^17Ne[n 7]	10	7	17.0177140(4)	109.2(6) ms	β^+, p (96.0%)	^16O	1/2−
					β^+, α (2.7%)	^13N
					β^+ (1.3%)	^17F
^18Ne	10	8	18.0057087(4)	1.66420(47) s	β^+	^18F	0+
^19Ne	10	9	19.00188090(17)	17.274(10) s	β^+	^19F	1/2+
^20Ne	10	10	19.9924401762(17)	Stable			0+	0.9048(3)	0.8847–0.9051
^21Ne	10	11	20.99384669(4)	Stable			3/2+	0.0027(1)	0.0027–0.0171
^22Ne	10	12	21.991385110(19)	Stable			0+	0.0925(3)	0.0920–0.0996
^23Ne	10	13	22.99446690(11)	37.140(28) s	β^−	^23Na	5/2+
^24Ne	10	14	23.9936106(6)	3.38(2) min	β^−	^24Na	0+
^25Ne	10	15	24.997810(30)	602(8) ms	β^−	^25Na	1/2+
^26Ne	10	16	26.000516(20)	197(2) ms	β^− (99.87%)	^26Na	0+
					β^−, n (0.13%)	^25Na
^27Ne	10	17	27.00757(10)	31.5(13) ms	β^− (98.0%)	^27Na	(3/2+)
					β^−, n (2.0%)	^26Na
^28Ne	10	18	28.01213(14)	20(1) ms	β^− (84.3%)	^28Na	0+
					β^−, n (12.0%)	^27Na
					β^−, 2n (3.7%)	^26Na
^29Ne	10	19	29.01975(16)	14.7(4) ms	β^− (68%)	^29Na	(3/2−)
					β^−, n (28%)	^28Na
					β^−, 2n (4%)	^27Na
^30Ne	10	20	30.02499(27)	7.22(18) ms	β^−	^30Na (78.1%)	0+
					β^−, n (13.0%)	^29Na
					β^−, 2n (8.9%)	^28Na
^31Ne	10	21	31.03347(29)	3.4(8) ms	β^−	^31Na	(3/2−)
					β^−, n	^30Na
^32Ne	10	22	32.03972(54)#	3.5(9) ms	β^−	^32Na	0+
					β^−, n	^31Na
^34Ne	10	24	34.05673(55)#	1# ms [>1.5 µs]	β^−	^34Na	0+

1. ^mNe – Excited nuclear isomer.
2. ( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.
3. # – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).
4. Modes of decay:

   n:	Neutron emission
   p:	Proton emission

5. Bold symbol as daughter – Daughter product is stable.
6. ( ) spin value – Indicates spin with weak assignment arguments.
7. Has 2 halo protons.

• The isotopic composition refers to that in air.

References

1. Meija, Juris; et al. (2016). "Atomic weights of the elements 2013 (IUPAC Technical Report)". Pure and Applied Chemistry. 88 (3): 265–91. doi:10.1515/pac-2015-0305.
2. Half-life, decay mode, nuclear spin, and isotopic composition is sourced in:
   Audi, G.; Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S. (2017). "The NUBASE2016 evaluation of nuclear properties" (PDF). Chinese Physics C. 41 (3): 030001. Bibcode:2017ChPhC..41c0001A. doi:10.1088/1674-1137/41/3/030001.
3. Wang, M.; Audi, G.; Kondev, F. G.; Huang, W. J.; Naimi, S.; Xu, X. (2017). "The AME2016 atomic mass evaluation (II). Tables, graphs, and references" (PDF). Chinese Physics C. 41 (3): 030003-1–030003-442. doi:10.1088/1674-1137/41/3/030003.
4. Wamers, F.; Marganiec, J.; Aksouh, F.; Aksyutina, Yu.; Álvarez-Pol, H.; Aumann, T.; Beceiro-Novo, S.; Boretzky, K.; Borge, M. J. G.; Chartier, M.; Chatillon, A.; Chulkov, L. V.; Cortina-Gil, D.; Emling, H.; Ershova, O.; Fraile, L. M.; Fynbo, H. O. U.; Galaviz, D.; Geissel, H.; Heil, M.; Hoffmann, D. H. H.; Johansson, H. T.; Jonson, B.; Karagiannis, C.; Kiselev, O. A.; Kratz, J. V.; Kulessa, R.; Kurz, N.; Langer, C.; Lantz, M.; Le Bleis, T.; Lemmon, R.; Litvinov, Yu. A.; Mahata, K.; Müntz, C.; Nilsson, T.; Nociforo, C.; Nyman, G.; Ott, W.; Panin, V.; Paschalis, S.; Perea, A.; Plag, R.; Reifarth, R.; Richter, A.; Rodriguez-Tajes, C.; Rossi, D.; Riisager, K.; Savran, D.; Schrieder, G.; Simon, H.; Stroth, J.; Sümmerer, K.; Tengblad, O.; Weick, H.; Wimmer, C.; Zhukov, M. V. (4 April 2014). "First Observation of the Unbound Nucleus ¹⁵Ne" (PDF). Physical Review Letters. 112 (13): 132502. doi:10.1103/PhysRevLett.112.132502 – via APS.