Average atomic weight: 186.207(1) u
| Isotope | Fraction | Atomic weight/u |
| 185 | 0.3740(2) | 184.9529545(13) |
| 187 | 0.6260(2) | 186.9557501(16) |
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)
