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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.

Quick Facts Main isotopes, Decay ...
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)
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The abundances of the naturally occurring isotopes of neon

List of isotopes

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More information Nuclide, Z ...
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)
Excitation energy 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− 24
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
 ?
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:
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  1. [n 1]
    mNe – Excited nuclear isomer.
  2. [n 2]
    ( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.
  3. [n 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. [n 4]
    Modes of decay:
    n:Neutron emission
    p:Proton emission
  5. [n 5]
    Bold symbol as daughter – Daughter product is stable.
  6. [n 6]
    ( ) spin value – Indicates spin with weak assignment arguments.
  7. [n 7]
    Has 2 halo protons.
  8. [n 8]
    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

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