| Proton | Neutron | Nuclear Spin | Energy State | |
|---|---|---|---|---|
| 197Os | 76 | 121 | 5/2 | |
| 198Ir | 77 | 121 | 2 | |
| 199Pt | 78 | 121 | -5/2 | |
| 199mPt | 78 | 121 | 13/2 | |
| 200Au | 79 | 121 | -1 | |
| 200mAu | 79 | 121 | -12 | |
| 201Hg | 80 | 121 | -3/2 | Stable |
| 201mHg | 80 | 121 | 13/2 | |
| 202Tl | 81 | 121 | -2 | |
| 202mTl | 81 | 121 | 7 | |
| 203m3Pb | 82 | 121 | -25/2 | |
| 203m2Pb | 82 | 121 | -29/2 | |
| 203Pb | 82 | 121 | -5/2 | |
| 203m1Pb | 82 | 121 | 13/2 | |
| 204m2Bi | 83 | 121 | 17 | |
| 204m1Bi | 83 | 121 | -10 | |
| 204Bi | 83 | 121 | 6 | |
| 205m1Po | 84 | 121 | -1/2 | |
| 205m3Po | 84 | 121 | -19/2 | |
| 205m4Po | 84 | 121 | -29/2 | |
| 205Po | 84 | 121 | -5/2 | |
| 205m2Po | 84 | 121 | 13/2 | |
| 206mAt | 85 | 121 | -10 | |
| 206At | 85 | 121 | 5 | |
| 207mRn | 86 | 121 | 13/2 | |
| 207Rn | 86 | 121 | -5/2 | |
| 208Fr | 87 | 121 | 7 | |
| 209Ra | 88 | 121 | -5/2 | |
| 210Ac | 89 | 121 | 7 | |
| 211Th | 90 | 121 | -5/2 | |
| 212Pa | 91 | 121 | 7 |