| Proton | Neutron | Nuclear Spin | Energy State | |
|---|---|---|---|---|
| 237Bk | 97 | 138 | -5/2 | |
| 236Bk | 97 | 139 | 2 | |
| 237Bk | 97 | 140 | 7/2 | |
| 238Bk | 97 | 141 | 4 | |
| 239Bk | 97 | 142 | 7/2 | |
| 240Bk | 97 | 143 | 3 | |
| 241Bk | 97 | 144 | 7/2 | |
| 242Bk | 97 | 145 | -2 | |
| 243Bk | 97 | 146 | -3/2 | |
| 244Bk | 97 | 147 | -4 | |
| 245Bk | 97 | 148 | -3/2 | |
| 246Bk | 97 | 149 | -2 | |
| 247Bk | 97 | 150 | -3/2 | |
| 248mBk | 97 | 151 | -1 | |
| 248Bk | 97 | 151 | 6 | |
| 249mBk | 97 | 152 | -3/2 | |
| 249Bk | 97 | 152 | 7/2 | |
| 250Bk | 97 | 153 | -2 | |
| 250m1Bk | 97 | 153 | 4 | |
| 250m2Bk | 97 | 153 | 7 | |
| 251mBk | 97 | 154 | 7/2 | |
| 251Bk | 97 | 154 | -3/2 | |
| 252mBk | 97 | 155 | 1 | |
| 253mBk | 97 | 156 | 3/2 | |
| 254mBk | 97 | 157 | 1 |