(this element does not have any stable isotopes)
Atomic weight of the most stable isotope: 244.0642053(56) u
| Isotope | Atomic weight/u | Half-life |
| 238 | 238.0495601(19) | 87.7 y 1 |
| 239 | 239.0521636(19) | 24110 y 30 |
| 240 | 240.0538138(19) | 6561 y 7 |
| 242 | 242.0587428(20) | 3.75e+5 y 3 |
| 244 | 244.0642053(56) | 8.00e+7 y 9 |
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)
