Atomic number: 83 Symbol: Bi
Average atomic weight: 208.98040(1) u
| Isotope | Fraction | Atomic weight/u |
| 209 | 1.0000(0) | 208.9803987(16) |
Atomic weights and isotopic compositions were obtained from NIST Database 144
(Atomic Line List 2.05b16, compiled on Jan 13, 2012)