| Proton | Neutron | Nuclear Spin | Energy State | |
|---|---|---|---|---|
| 103Sb | 51 | 52 | 5/2 | |
| 104Sb | 51 | 53 | 2 | |
| 105Sb | 51 | 54 | 5/2 | |
| 106Sb | 51 | 55 | 4 | |
| 107Sb | 51 | 56 | 5/2 | |
| 108Sb | 51 | 57 | 4 | |
| 109Sb | 51 | 58 | 5/2 | |
| 110Sb | 51 | 59 | 4 | |
| 111Sb | 51 | 60 | 5/2 | |
| 112Sb | 51 | 61 | 3 | |
| 113Sb | 51 | 62 | 5/2 | |
| 114mSb | 51 | 63 | -8 | |
| 114Sb | 51 | 63 | 3 | |
| 115Sb | 51 | 64 | 5/2 | |
| 116Sb | 51 | 65 | 3 | |
| 116m2Sb | 51 | 65 | -8 | |
| 116m1Sb | 51 | 65 | 1 | |
| 117Sb | 51 | 66 | 5/2 | |
| 118m2Sb | 51 | 67 | -8 | |
| 118Sb | 51 | 67 | 1 | |
| 118m1Sb | 51 | 67 | 3 | |
| 119m1Sb | 51 | 68 | -19/2 | |
| 119m2Sb | 51 | 68 | 27/2 | |
| 119Sb | 51 | 68 | 5/2 | |
| 120m3Sb | 51 | 69 | -6 | |
| 120m1Sb | 51 | 69 | -8 | |
| 120Sb | 51 | 69 | 1 | |
| 120m2Sb | 51 | 69 | 3 | |
| 121Sb | 51 | 70 | 5/2 | Stable |
| 122m3Sb | 51 | 71 | -8 | |
| 122m1Sb | 51 | 71 | 3 | |
| 122m2Sb | 51 | 71 | 5 | |
| 122Sb | 51 | 71 | -2 | |
| 123Sb | 51 | 72 | 7/2 | Stable |
| 124Sb | 51 | 73 | -3 | |
| 124m2Sb | 51 | 73 | -8 | |
| 124m1Sb | 51 | 73 | 5 | |
| 125Sb | 51 | 74 | 7/2 | |
| 126m2Sb | 51 | 75 | -3 | |
| 126Sb | 51 | 75 | -8 | |
| 126m1Sb | 51 | 75 | 5 | |
| 127Sb | 51 | 76 | 7/2 | |
| 128Sb | 51 | 77 | -8 | |
| 128mSb | 51 | 77 | 5 | |
| 129Sb | 51 | 78 | 7/2 | |
| 129m3Sb | 51 | 78 | 23/2 | |
| 129m1Sb | 51 | 78 | -19/2 | |
| 129m2Sb | 51 | 78 | -15/2 | |
| 130Sb | 51 | 79 | -8 | |
| 131Sb | 51 | 80 | 7/2 | |
| 132m2Sb | 51 | 81 | -6 | |
| 132m1Sb | 51 | 81 | -8 | |
| 132Sb | 51 | 81 | 4 | |
| 133Sb | 51 | 82 | 7/2 | |
| 134Sb | 51 | 83 | 0 | |
| 134mSb | 51 | 83 | -7 | |
| 135Sb | 51 | 84 | 7/2 | |
| 136Sb | 51 | 85 | -1 | |
| 136mSb | 51 | 85 | -6 | |
| 137Sb | 51 | 86 | 7/2 | |
| 138Sb | 51 | 87 | -2 | |
| 139Sb | 51 | 88 | 7/2 |