Average atomic weight: 144.242(3) u
| Isotope | Fraction | Atomic weight/u |
| 142 | 0.27152(40) | 141.9077290(20) |
| 143 | 0.12174(26) | 142.9098200(20) |
| 144 | 0.23798(19) | 143.9100930(20) |
| 145 | 0.08293(12) | 144.9125793(20) |
| 146 | 0.17189(32) | 145.9131226(20) |
| 148 | 0.05756(21) | 147.9168993(26) |
| 150 | 0.05638(28) | 149.9209022(18) |
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)
