| Nuclide | Neutrons | Stability |
|---|---|---|
| 1H(Protium)(Main) | 0 | Stable |
| 2H(Deuterium) | 1 | Stable |
| 3H(Tritium) | 2 | 12.32 years of half life |
| 4H | 3 | 9.9x10-23 seconds of half life |
| 5H | 4 | 8x10-23 seconds of half life |
| 6H | 5 | 2.9x10-22 seconds of half life |
| 7H | 6 | 2.3x10-23 seconds of half life |