| Nuclide | Neutrons | Stability |
|---|---|---|
| 8C | 2 | 3.5x10-21 seconds of half life |
| 9C | 3 | 126.5 milliseconds of half life |
| 10C | 4 | 19.3 seconds of half life |
| 11C | 5 | 20.34 minutes of half life |
| 12C(Main) | 6 | Stable |
| 13C | 7 | Stable |
| 14C | 8 | 5.7x103 years of half life |
| 15C | 9 | 2.44 seconds of half life |
| 16C | 10 | 750 milliseconds of half life |
| 17C | 11 | 193 milliseconds of half life |
| 18C | 12 | 92 milliseconds of half life |
| 19C | 13 | 46.2 milliseconds of half life |
| 20C | 14 | 16 milliseconds of half life |
| 21C | 15 | <30 nanoseconds of half life |
| 22C | 16 | 6.2 milliseconds of half life |
| 23C | 17 | Unstable |