Isotopes of neon

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.

Isotopes of neon (10Ne)
Main isotopes[1] Decay
abun­dance half-life (t1/2) mode pro­duct
20Ne 90.5% stable
21Ne 0.27% stable
22Ne 9.25% stable
Standard atomic weight Ar°(Ne)
  • 20.1797±0.0006
  • 20.180±0.001 (abridged)[2][3]
The abundances of the naturally occurring isotopes of neon

List of isotopes
Nuclide[4]
[n 1]		 Z N Isotopic mass (Da)[5]
[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
15
Ne
[6]		 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][7]
21
Ne
 10 11 20.99384669(4) Stable 3/2+ 0.0027(1) [0.0027, 0.0171][7]
22
Ne
 10 12 21.991385114(19) Stable 0+ 0.0925(3) [0.0920, 0.0996][7]
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+
β−n (0.13(3)%) 25
Na
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
 ?
33
Ne
?[n 9]		 10 23 33.049520(640)# < 260 ns n ?[n 8] 32
Ne
 7/2−#
34
Ne
 10 24 34.056730(550)# 2 ms# [> 1.5 μs] β− ?[n 8] 34
Na
 0+
β−2n ?[n 8] 32
Ne
 ?
β−n ?[n 8] 33
Ne
 ?
This table header & footer:
  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.
  8. Decay mode shown is energetically allowed, but has not been experimentally observed to occur in this nuclide.
  9. This isotope has not yet been observed; given data is inferred or estimated from periodic trends.
  • The isotopic composition refers to that in air.

References
  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.
  3. Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; et al. (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.
  4. Half-life, decay mode, nuclear spin, and isotopic composition is sourced in:
    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.
  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.
  6. 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.
  7. 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. ISSN 1365-3075. S2CID 104472050.
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