# Isotopes of neon

Neon ($_{10}$Ne) 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 | Z | N | Isotopic mass (Da) | Half-life [resonance width] | Decay mode | Daughter isotope | Spin and parity | Natural abundance (mole fraction) | Natural abundance (mole fraction) |
| Nuclide | Excitation energy | Excitation energy | Excitation energy | Half-life [resonance width] | Decay mode | Daughter isotope | Spin and parity | Normal proportion | Range of variation |
| $^{15}$ Ne | 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 | 10 | 7 | 17.0177140(4) | 109.2(6) ms | β$^+$p (94.4(2.9)%) | $^{16}$ O | 1/2− | | |
| $^{17}$ Ne | 10 | 7 | 17.0177140(4) | 109.2(6) ms | β$^+$α (3.51(1)%) | $^{13}$ N | 1/2− | | |
| $^{17}$ Ne | 10 | 7 | 17.0177140(4) | 109.2(6) ms | β$^+$ (2.1(2.9)%) | $^{17}$ F | 1/2− | | |
| $^{17}$ Ne | 10 | 7 | 17.0177140(4) | 109.2(6) ms | β$^+$pα (0.014(4)%) | $^{12}$ C | 1/2− | | |
| $^{18}$ 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 | Stable | Stable | 0+ | 0.9048(3) | [0.8847, 0.9051] |
| $^{21}$ Ne | 10 | 11 | 20.99384669(4) | Stable | Stable | Stable | 3/2+ | 0.0027(1) | [0.0027, 0.0171] |
| $^{22}$ Ne | 10 | 12 | 21.991385114(19) | Stable | Stable | Stable | 0+ | 0.0925(3) | [0.0920, 0.0996] |
| $^{23}$ 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+ | | |
| $^{26}$ 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+) | | |
| $^{27}$ Ne | 10 | 17 | 27.007570(100) | 30.9(1.1) ms | β$^−$n (2.0(5)%) | $^{26}$ Na | (3/2+) | | |
| $^{27}$ Ne | 10 | 17 | 27.007570(100) | 30.9(1.1) ms | β$^−$2n ? | $^{25}$ Na ? | (3/2+) | | |
| $^{28}$ Ne | 10 | 18 | 28.012130(140) | 18.8(2) ms | β$^−$ (84.3(1.1)%) | $^{28}$ Na | 0+ | | |
| $^{28}$ Ne | 10 | 18 | 28.012130(140) | 18.8(2) ms | β$^−$n (12(1)%) | $^{27}$ Na | 0+ | | |
| $^{28}$ Ne | 10 | 18 | 28.012130(140) | 18.8(2) ms | β$^−$2n (3.7(5)%) | $^{26}$ Na | 0+ | | |
| $^{29}$ Ne | 10 | 19 | 29.019750(160) | 14.7(4) ms | β$^−$ (68.0(5.1)%) | $^{29}$ Na | (3/2−) | | |
| $^{29}$ Ne | 10 | 19 | 29.019750(160) | 14.7(4) ms | β$^−$n (28(5)%) | $^{28}$ Na | (3/2−) | | |
| $^{29}$ Ne | 10 | 19 | 29.019750(160) | 14.7(4) ms | β$^−$2n (4(1)%) | $^{27}$ Na | (3/2−) | | |
| $^{30}$ Ne | 10 | 20 | 30.024990(270) | 7.22(18) ms | β$^−$ (78.1(4.6)%) | $^{30}$ Na | 0+ | | |
| $^{30}$ Ne | 10 | 20 | 30.024990(270) | 7.22(18) ms | β$^−$n (13(4)%) | $^{29}$ Na | 0+ | | |
| $^{30}$ Ne | 10 | 20 | 30.024990(270) | 7.22(18) ms | β$^−$2n (8.9(2.3)%) | $^{28}$ Na | 0+ | | |
| $^{31}$ Ne | 10 | 21 | 31.033470(290) | 3.4(8) ms | β$^−$ | $^{31}$ Na | (3/2−) | | |
| $^{31}$ Ne | 10 | 21 | 31.033470(290) | 3.4(8) ms | β$^−$n ? | $^{30}$ Na ? | (3/2−) | | |
| $^{31}$ Ne | 10 | 21 | 31.033470(290) | 3.4(8) ms | β$^−$2n ? | $^{29}$ Na ? | (3/2−) | | |
| $^{32}$ Ne | 10 | 22 | 32.039720(540)# | 3.5(9) ms | β$^−$ | $^{32}$ Na | 0+ | | |
| $^{32}$ Ne | 10 | 22 | 32.039720(540)# | 3.5(9) ms | β$^−$n ? | $^{31}$ Na ? | 0+ | | |
| $^{32}$ Ne | 10 | 22 | 32.039720(540)# | 3.5(9) ms | β$^−$2n ? | $^{30}$ Na ? | 0+ | | |
| $^{34}$ Ne | 10 | 24 | 34.056730(550)# | 2 ms# [> 1.5 μs] | β$^−$ ? | $^{34}$ Na | 0+ | | |
| $^{34}$ Ne | 10 | 24 | 34.056730(550)# | 2 ms# [> 1.5 μs] | β$^−$2n ? | $^{32}$ Na ? | 0+ | | |
| $^{34}$ Ne | 10 | 24 | 34.056730(550)# | 2 ms# [> 1.5 μs] | β$^−$n ? | $^{33}$ Na ? | 0+ | | |
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* ↑ $^m$Ne – 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.
* 1 2 3 4 5 6 7 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.