Average atomic weight: 204.382–204.385 u
| Isotope | Fraction | Atomic weight/u |
| 203 | 0.2952(1) | 202.9723446(14) |
| 205 | 0.7048(1) | 204.9744278(14) |
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)
