| 166Er | Half-life | Boson, 68p 98n |  |
| Stable | Spin 0 Parity 1 |
This isotope is stable and thus has no decay products, so instead we show decay chains that lead down to it. |
| Atomic Weight | 165.930293061 |
| Abundance | 33.503% |
| Mass Excess | -64.931595MeV |
| Binding Energy | 8.141992MeV |
| Magnetic Moment | 0 μ |
| Quadrupole Moment | N/A |
|