| Proton | Neutron | Nuclear Spin | Energy State | |
|---|---|---|---|---|
| 134Gd | 64 | 70 | 0 | |
| 135Gd | 64 | 71 | -3/2 | |
| 136Gd | 64 | 72 | 4 | |
| 137Gd | 64 | 73 | 7/2 | |
| 138mGd | 64 | 74 | -8 | |
| 138Gd | 64 | 74 | 0 | |
| 139mGd | 64 | 75 | 1/2 | |
| 139Gd | 64 | 75 | -9/2 | |
| 140Gd | 64 | 76 | 0 | |
| 141Gd | 64 | 77 | 1/2 | |
| 141mGd | 64 | 77 | -11/2 | |
| 142Gd | 64 | 78 | 0 | |
| 143mGd | 64 | 79 | -11/2 | |
| 143Gd | 64 | 79 | 1/2 | |
| 144Gd | 64 | 80 | 0 | |
| 145Gd | 64 | 81 | 1/2 | |
| 145mGd | 64 | 81 | -11/2 | |
| 146Gd | 64 | 82 | 0 | |
| 147mGd | 64 | 83 | 49/2 | |
| 147Gd | 64 | 83 | -7/2 | |
| 148Gd | 64 | 84 | 0 | |
| 149Gd | 64 | 85 | -7/2 | |
| 150Gd | 64 | 86 | 0 | |
| 151Gd | 64 | 87 | -7/2 | |
| 152Gd | 64 | 88 | 0 | |
| 153m1Gd | 64 | 89 | 9/2 | |
| 153Gd | 64 | 89 | -3/2 | |
| 153m2Gd | 64 | 89 | -11/2 | |
| 154Gd | 64 | 90 | 0 | Stable |
| 155mGd | 64 | 91 | -11/2 | |
| 155Gd | 64 | 91 | -3/2 | Stable |
| 156Gd | 64 | 92 | 0 | Stable |
| 156mGd | 64 | 92 | -7 | |
| 157Gd | 64 | 93 | -3/2 | Stable |
| 158Gd | 64 | 94 | 0 | Stable |
| 159Gd | 64 | 95 | -3/2 | |
| 160Gd | 64 | 96 | 0 | Stable |
| 161Gd | 64 | 97 | -5/2 | |
| 162Gd | 64 | 98 | 0 | |
| 163Gd | 64 | 99 | 7/2 | |
| 164Gd | 64 | 100 | 0 | |
| 165Gd | 64 | 101 | -1/2 | |
| 166Gd | 64 | 102 | 0 | |
| 167Gd | 64 | 103 | -5/2 | |
| 168Gd | 64 | 104 | 0 | |
| 169Gd | 64 | 105 | -7/2 |