| Proton | Neutron | Nuclear Spin | Energy State | |
|---|---|---|---|---|
| 28Cl | 17 | 11 | 1 | |
| 29Cl | 17 | 12 | 3/2 | |
| 30Cl | 17 | 13 | 3 | |
| 31Cl | 17 | 14 | 3/2 | |
| 32Cl | 17 | 15 | 1 | |
| 33Cl | 17 | 16 | 3/2 | |
| 34mCl | 17 | 17 | 3 | |
| 34Cl | 17 | 17 | 0 | |
| 35Cl | 17 | 18 | 3/2 | Stable |
| 36Cl | 17 | 19 | 2 | |
| 37Cl | 17 | 20 | 3/2 | Stable |
| 38mCl | 17 | 21 | -5 | |
| 38Cl | 17 | 21 | -2 | |
| 39Cl | 17 | 22 | 3/2 | |
| 40Cl | 17 | 23 | -2 | |
| 41Cl | 17 | 24 | 3/2 | |
| 42Cl | 17 | 25 | 2 | |
| 43Cl | 17 | 26 | 3/2 | |
| 44Cl | 17 | 27 | 2 | |
| 45Cl | 17 | 28 | 3/2 | |
| 46Cl | 17 | 29 | 2 | |
| 47Cl | 17 | 30 | 3/2 | |
| 48Cl | 17 | 31 | 2 | |
| 49Cl | 17 | 32 | 3/2 | |
| 50Cl | 17 | 33 | 1 | |
| 51Cl | 17 | 34 | 3/2 |