| Proton | Neutron | Nuclear Spin | Energy State | |
|---|---|---|---|---|
| 177mTl | 81 | 96 | -11/2 | |
| 177Tl | 81 | 96 | 1/2 | |
| 178Tl | 81 | 97 | 0 | |
| 179mTl | 81 | 98 | -9/2 | |
| 179Tl | 81 | 98 | 1/2 | |
| 180Tl | 81 | 99 | 0 | |
| 181mTl | 81 | 100 | -9/2 | |
| 181Tl | 81 | 100 | 1/2 | |
| 182m2Tl | 81 | 101 | -10 | |
| 182m1Tl | 81 | 101 | 7 | |
| 182Tl | 81 | 101 | -2 | |
| 183Tl | 81 | 102 | 1/2 | |
| 183m2Tl | 81 | 102 | 13/2 | |
| 183m1Tl | 81 | 102 | -9/2 | |
| 184Tl | 81 | 103 | -2 | |
| 184m2Tl | 81 | 103 | -10 | |
| 184m1Tl | 81 | 103 | 7 | |
| 185Tl | 81 | 104 | 1/2 | |
| 185mTl | 81 | 104 | -9/2 | |
| 186m1Tl | 81 | 105 | 7 | |
| 186Tl | 81 | 105 | -2 | |
| 186m2Tl | 81 | 105 | -10 | |
| 187mTl | 81 | 106 | -9/2 | |
| 187Tl | 81 | 106 | 1/2 | |
| 188Tl | 81 | 107 | -2 | |
| 188m2Tl | 81 | 107 | -9 | |
| 188m1Tl | 81 | 107 | 7 | |
| 189Tl | 81 | 108 | 1/2 | |
| 189mTl | 81 | 108 | -9/2 | |
| 190m1Tl | 81 | 109 | 7 | |
| 190m3Tl | 81 | 109 | -9 | |
| 190Tl | 81 | 109 | -2 | |
| 190m2Tl | 81 | 109 | -8 | |
| 191mTl | 81 | 110 | -9/2 | |
| 191Tl | 81 | 110 | 1/2 | |
| 192m2Tl | 81 | 111 | -8 | |
| 192Tl | 81 | 111 | -2 | |
| 192m1Tl | 81 | 111 | 7 | |
| 193Tl | 81 | 112 | 1/2 | |
| 193mTl | 81 | 112 | -9/2 | |
| 194Tl | 81 | 113 | -2 | |
| 194mTl | 81 | 113 | 7 | |
| 195mTl | 81 | 114 | -9/2 | |
| 195Tl | 81 | 114 | 1/2 | |
| 196Tl | 81 | 115 | -2 | |
| 196mTl | 81 | 115 | 7 | |
| 197Tl | 81 | 116 | 1/2 | |
| 197mTl | 81 | 116 | -9/2 | |
| 198m1Tl | 81 | 117 | 7 | |
| 198m2Tl | 81 | 117 | 5 | |
| 198Tl | 81 | 117 | -2 | |
| 198m3Tl | 81 | 117 | -10 | |
| 199mTl | 81 | 118 | -9/2 | |
| 199Tl | 81 | 118 | 1/2 | |
| 200Tl | 81 | 119 | -2 | |
| 200m2Tl | 81 | 119 | 5 | |
| 200m1Tl | 81 | 119 | 7 | |
| 201mTl | 81 | 120 | -9/2 | |
| 201Tl | 81 | 120 | 1/2 | |
| 202mTl | 81 | 121 | 7 | |
| 202Tl | 81 | 121 | -2 | |
| 203Tl | 81 | 122 | 1/2 | Stable |
| 203mTl | 81 | 122 | 25/2 | |
| 204Tl | 81 | 123 | -2 | |
| 204m2Tl | 81 | 123 | -12 | |
| 204m1Tl | 81 | 123 | 7 | |
| 204m3Tl | 81 | 123 | 20 | |
| 205m1Tl | 81 | 124 | 25/2 | |
| 205m2Tl | 81 | 124 | -35/2 | |
| 205Tl | 81 | 124 | 1/2 | Stable |
| 206Tl | 81 | 125 | 0 | |
| 206mTl | 81 | 125 | -12 | |
| 207mTl | 81 | 126 | -11/2 | |
| 207Tl | 81 | 126 | 1/2 | |
| 208Tl | 81 | 127 | 5 | |
| 209Tl | 81 | 128 | 1/2 | |
| 210Tl | 81 | 129 | 5 | |
| 211Tl | 81 | 130 | 1/2 | |
| 212Tl | 81 | 131 | 5 |