(this element does not have any stable isotopes)
Atomic weight of the most stable isotope: 243.0613813(24) u
| Isotope | Atomic weight/u | Half-life |
| 241 | 241.0568293(19) | 432.6 y 6 |
| 243 | 243.0613813(24) | 7364 y 22 |
Units: y = year, d = day, h = hour, m = minute, s = second, ms = millisecond, µs = microsecond.
Numbers in italics are uncertainties with the same unit as the last digit of the half-life.
Atomic weights were obtained from NIST Database 144
The half-life of radioactive isotopes was obtained from the Nuclear Wallet Cards
The Atomic Line List does not contain any data for this element
(Atomic Line List v3.00b5)
