| Nuclide | Neutrons | Stability |
|---|---|---|
| 5Be | 1 | Unstable |
| 6Be | 2 | 5.8x10-22 seconds of half life |
| 7Be | 3 | 3.7x10-22 seconds of half life |
| 8Be | 4 | 1.6x10-22 seconds of half life |
| 9Be(Main) | 5 | Stable |
| 10Be | 6 | 1.39x106 years of half life |
| 11Be | 7 | 13.81 seconds of half life |
| 12Be | 8 | 21.4 milliseconds of half life |
| 13Be | 9 | 2.7x10-21 seconds of half life |
| 14Be | 10 | 4.4 milliseconds of half life |
| 15Be | 11 | 200 nanoseconds of half life |
| 16Be | 12 | Unstable |