Table
| nuclide symbol |
Z(p) | N(n) | isotopic mass (u) | half-life | decay mode(s) |
daughter isotope(s) |
nuclear spin |
representative isotopic composition (mole fraction) |
range of natural variation (mole fraction) |
|---|---|---|---|---|---|---|---|---|---|
| 2He | 2 | 0 | 2 | ? | p (>99.99%) | 2 1H | 0+(#) | ||
| β+ (<0.01%) | 2H | ||||||||
| 3He | 2 | 1 | 3.0160293191(26) | Stable | 1/2+ | 1.34(3)×10−6 | 4.6×10−10-4.1×10−5 | ||
| 4He | 2 | 2 | 4.00260325415(6) | Stable | 0+ | 0.99999866(3) | 0.999959-1 | ||
| 5He | 2 | 3 | 5.01222(5) | 700(30)×10−24 s | n | 4He | 3/2- | ||
| 6He | 2 | 4 | 6.0188891(8) | 806.7(15) ms | β- (99.99%) | 6Li | 0+ | ||
| β-, fission (2.8×10−4%) | 4He, 2H | ||||||||
| 7He | 2 | 5 | 7.028021(18) | 2.9(5)×10−21 s |
n | 6He | (3/2)- | ||
| 8He | 2 | 6 | 8.033922(7) | 119.0(15) ms | β- (83.1%) | 8Li | 0+ | ||
| β-,n (16.0%) | 7Li | ||||||||
| β-, fission (.09%) | 5He, 3H | ||||||||
| 9He | 2 | 7 | 9.04395(3) | 7(4)×10−21 s | n | 8He | 1/2(-#) | ||
| 10He | 2 | 8 | 10.05240(8) | 2.7(18)×10−21 s | 2n | 8He | 0+ | ||
Read more about this topic: Isotopes Of Helium
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