| element_z | element_symbol | Known | Stable | Unstable | Predicted | Gap |
|---|---|---|---|---|---|---|
| 82 | Pb | 43 | 4 | 39 | 102 | 59 |
| 84 | Po | 42 | 0 | 42 | 100 | 58 |
| 60 | Nd | 41 | 5 | 36 | 97 | 56 |
| 83 | Bi | 41 | 0 | 41 | 97 | 56 |
| 62 | Sm | 41 | 7 | 34 | 97 | 56 |
| 70 | Yb | 41 | 7 | 34 | 97 | 56 |
| 64 | Gd | 41 | 7 | 34 | 97 | 56 |
| 66 | Dy | 40 | 7 | 33 | 95 | 55 |
| 54 | Xe | 40 | 9 | 31 | 95 | 55 |
| 56 | Ba | 40 | 7 | 33 | 95 | 55 |
| 58 | Ce | 40 | 4 | 36 | 95 | 55 |
| 63 | Eu | 40 | 2 | 38 | 95 | 55 |
| 50 | Sn | 40 | 10 | 30 | 95 | 55 |
| 68 | Er | 40 | 6 | 34 | 95 | 55 |
| 71 | Lu | 40 | 1 | 39 | 95 | 55 |
| 49 | In | 39 | 2 | 37 | 93 | 54 |
| 65 | Tb | 39 | 1 | 38 | 93 | 54 |
| 69 | Tm | 39 | 1 | 38 | 93 | 54 |
| 75 | Re | 39 | 1 | 38 | 93 | 54 |
| 61 | Pm | 39 | 0 | 39 | 93 | 54 |
| 59 | Pr | 39 | 1 | 38 | 93 | 54 |
| 81 | Tl | 39 | 2 | 37 | 93 | 54 |
| 85 | At | 39 | 0 | 39 | 93 | 54 |
| 55 | Cs | 39 | 1 | 38 | 93 | 54 |
| 86 | Rn | 39 | 0 | 39 | 93 | 54 |