| Nuclide | Neutrons | Stability |
|---|---|---|
| 2He(Diproton) | 0 | 10-9 seconds of half life |
| 3He | 1 | Stable |
| 4He(Main) | 2 | Stable |
| 5He | 3 | 7.6x10-22 seconds of half life |
| 6He | 4 | 806.7 milliseconds of half life |
| 7He | 5 | 3x10-21 seconds of half life |
| 8He | 6 | 0.1 seconds of half life |
| 9He | 7 | 7x10-21 seconds of half life |
| 10He | 8 | 1.5x10-21 seconds of half life |