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Isotopes of neon (₁₀Ne)
Standard atomic weight Ar°(Ne)
	20.1797±0.0006; 20.180±0.001 (abridged);

Neon (₁₀Ne) possesses three stable isotopes: ²⁰
Ne
, ²¹
Ne
, and ²²
Ne
. In addition, 17 radioactive isotopes have been discovered, ranging from ¹⁵
Ne
to ³⁴
Ne
, all short-lived. The longest-lived is ²⁴
Ne
with a half-life of 3.38(2) min. All others are under a minute, most under a second. The least stable is ¹⁵
Ne
with a half-life of 770(300) ys (7.7(3.0)×10⁻²² s). See isotopes of carbon for notes about the measurement. Light radioactive neon isotopes usually decay to fluorine or oxygen, while heavier ones decay to sodium.

List of isotopes

Nuclide ^{[n 1]}	Z	N	Isotopic mass (Da)^[4] ^{[n 2]}^{[n 3]}	Half-life^[1] [resonance width]	Decay mode^[1] ^{[n 4]}	Daughter isotope ^{[n 5]}	Spin and parity^[1] ^{[n 6]}	Natural abundance (mole fraction)
Nuclide ^{[n 1]}	Excitation energy			Half-life^[1] [resonance width]	Decay mode^[1] ^{[n 4]}	Daughter isotope ^{[n 5]}	Spin and parity^[1] ^{[n 6]}	Normal proportion^[1]	Range of variation
¹⁵ Ne ^[5]	10	5	15.043170(70)	770(300) ys [590(230) keV]	2p	¹³ O	(3/2−)
¹⁶ Ne	10	6	16.025751(22)	> 5.7 zs [< 80 keV]	2p	¹⁴ O	0+
¹⁷ Ne ^{[n 7]}	10	7	17.0177140(4)	109.2(6) ms	β⁺p (94.4(2.9)%)	¹⁶ O	1/2−
					β⁺α (3.51(1)%)	¹³ N
					β⁺ (2.1(2.9)%)	¹⁷ F
					β⁺pα (0.014(4)%)	¹² C
¹⁸ Ne	10	8	18.0057087(4)	1664.20(47) ms	β⁺	¹⁸ F	0+
¹⁹ Ne	10	9	19.00188091(17)	17.2569(19) s	β⁺	¹⁹ F	1/2+
²⁰ Ne	10	10	19.9924401753(16)	Stable			0+	0.9048(3)	[0.8847, 0.9051]^[6]
²¹ Ne	10	11	20.99384669(4)	Stable			3/2+	0.0027(1)	[0.0027, 0.0171]^[6]
²² Ne	10	12	21.991385114(19)	Stable			0+	0.0925(3)	[0.0920, 0.0996]^[6]
²³ Ne	10	13	22.99446691(11)	37.15(3) s	β⁻	²³ Na	5/2+
²⁴ Ne	10	14	23.9936106(6)	3.38(2) min	β⁻	^24m Na	0+
²⁵ Ne	10	15	24.997810(30)	602(8) ms	β⁻	²⁵ Na	1/2+
²⁶ Ne	10	16	26.000516(20)	197(2) ms	β⁻ (99.87(3)%)	²⁶ Na	0+
²⁶ Ne	10	16	26.000516(20)	197(2) ms	β⁻n (0.13(3)%)	²⁵ Na	0+
²⁷ Ne	10	17	27.007570(100)	30.9(1.1) ms	β⁻ (98.0(5)%)	²⁷ Na	(3/2+)
					β⁻n (2.0(5)%)	²⁶ Na
					β⁻2n ?^{[n 8]}	²⁵ Na ?
²⁸ Ne	10	18	28.012130(140)	18.8(2) ms	β⁻ (84.3(1.1)%)	²⁸ Na	0+
					β⁻n (12(1)%)	²⁷ Na
					β⁻2n (3.7(5)%)	²⁶ Na
²⁹ Ne	10	19	29.019750(160)	14.7(4) ms	β⁻ (68.0(5.1)%)	²⁹ Na	(3/2−)
					β⁻n (28(5)%)	²⁸ Na
					β⁻2n (4(1)%)	²⁷ Na
³⁰ Ne	10	20	30.024990(270)	7.22(18) ms	β⁻ (78.1(4.6)%)	³⁰ Na	0+
					β⁻n (13(4)%)	²⁹ Na
					β⁻2n (8.9(2.3)%)	²⁸ Na
³¹ Ne	10	21	31.033470(290)	3.4(8) ms	β⁻	³¹ Na	(3/2−)
					β⁻n ?^{[n 8]}	³⁰ Na ?
					β⁻2n ?^{[n 8]}	²⁹ Na ?
³² Ne	10	22	32.039720(540)#	3.5(9) ms	β⁻	³² Na	0+
					β⁻n ?^{[n 8]}	³¹ Na ?
					β⁻2n ?^{[n 8]}	³⁰ Na ?
³⁴ Ne	10	24	34.056730(550)#	2 ms# [> 1.5 μs]	β⁻ ?^{[n 8]}	³⁴ Na	0+
					β⁻2n ?^{[n 8]}	³² Na ?
					β⁻n ?^{[n 8]}	³³ Na ?
This table header & footer:

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

n: Neutron emission

p: Proton emission
^ Bold symbol as daughter – Daughter product is stable.
^ ( ) spin value – Indicates spin with weak assignment arguments.
^ Has 2 halo protons.
^ ^a ^b ^c ^d ^e ^f ^g ^h Decay mode shown is energetically allowed, but has not been experimentally observed to occur in this nuclide.

The isotopic composition refers to that in air.

References

^ ^a ^b ^c ^d ^e Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae.
^ "Standard Atomic Weights: Neon". CIAAW. 1985.
^ Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (2022-05-04). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry. doi:10.1515/pac-2019-0603. ISSN 1365-3075.
^ Wang, Meng; Huang, W.J.; Kondev, F.G.; Audi, G.; Naimi, S. (2021). "The AME 2020 atomic mass evaluation (II). Tables, graphs and references*". Chinese Physics C. 45 (3): 030003. doi:10.1088/1674-1137/abddaf.
^ 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. PMID 24745409 – via APS.
^ ^a ^b ^c Meija, Juris; Coplen, Tyler B.; Berglund, Michael; Brand, Willi A.; Bièvre, Paul De; Gröning, Manfred; Holden, Norman E.; Irrgeher, Johanna; Loss, Robert D.; Walczyk, Thomas; Prohaska, Thomas (2016-03-01). "Isotopic compositions of the elements 2013 (IUPAC Technical Report)". Pure and Applied Chemistry. 88 (3): 293–306. doi:10.1515/pac-2015-0503. hdl:11858/00-001M-0000-0029-C408-7. ISSN 1365-3075. S2CID 104472050.

[4] Ne – Excited nuclear isomer.

[6] ( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.

[TMS-7] # – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).

[8] Modes of decay:

n: Neutron emission

p: Proton emission

[9] Bold symbol as daughter – Daughter product is stable.

[10] ( ) spin value – Indicates spin with weak assignment arguments.

[12] Has 2 halo protons.

[decay_mode_1-14] ^ ^a ^b ^c ^d ^e ^f ^g ^h Decay mode shown is energetically allowed, but has not been experimentally observed to occur in this nuclide.

[NUBASE2020-1] Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae.

[2] "Standard Atomic Weights: Neon". CIAAW. 1985.

[CIAAW2021-3] Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (2022-05-04). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry. doi:10.1515/pac-2019-0603. ISSN 1365-3075.

[AME2020_II-5] Wang, Meng; Huang, W.J.; Kondev, F.G.; Audi, G.; Naimi, S. (2021). "The AME 2020 atomic mass evaluation (II). Tables, graphs and references*". Chinese Physics C. 45 (3): 030003. doi:10.1088/1674-1137/abddaf.

[Ne15-11] 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. PMID 24745409 – via APS.

[Isotopic_Composition_of_Elements-13] Meija, Juris; Coplen, Tyler B.; Berglund, Michael; Brand, Willi A.; Bièvre, Paul De; Gröning, Manfred; Holden, Norman E.; Irrgeher, Johanna; Loss, Robert D.; Walczyk, Thomas; Prohaska, Thomas (2016-03-01). "Isotopic compositions of the elements 2013 (IUPAC Technical Report)". Pure and Applied Chemistry. 88 (3): 293–306. doi:10.1515/pac-2015-0503. hdl:11858/00-001M-0000-0029-C408-7. ISSN 1365-3075. S2CID 104472050.

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List of isotopes

References