(this element does not have any stable isotopes)
Atomic weight of the most stable isotope: 247.0703073(59) u
| Isotope | Atomic weight/u | Half-life |
| 245 | 245.0663618(24) | 4.95 d 3 |
| 246 | 246.068673(64) | 1.80 d 2 |
| 247 | 247.0703073(59) | 1380 y 250 |
| 248 | 248.073088(76) | > 9 y |
| 249 | 249.0749877(27) | 330 d 4 |
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)
