Average atomic weight: 178.49(2) u
| Isotope | Fraction | Atomic weight/u |
| 174 | 0.0016(1) | 173.9400461(28) |
| 176 | 0.0526(7) | 175.9414076(22) |
| 177 | 0.1860(9) | 176.9432277(20) |
| 178 | 0.2728(7) | 177.9437058(20) |
| 179 | 0.1362(2) | 178.9458232(20) |
| 180 | 0.3508(16) | 179.9465570(20) |
Atomic weights and isotopic compositions were obtained from NIST Database 144
The Atomic Line List does not contain any data for this element
(Atomic Line List v3.00b5)
