Average atomic weight: 180.94788(2) u
| Isotope | Fraction | Atomic weight/u |
| 180 | 0.0001201(32) | 179.9474648(24) |
| 181 | 0.9998799(32) | 180.9479958(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)
