(this element does not have any stable isotopes)
Atomic weight of the most stable isotope: 270.13336(31) u
| Isotope | Atomic weight/u | Half-life |
| 260 | 260.12166(26) | 35 ms +19-9 |
| 261 | 261.12145(22) | 11.8 ms +39-24 |
| 262 | 262.12297(33) | 22 ms 4 |
| 264 | 264.12459(19) | 0.44 s +60-16 |
| 265 | 265.12491(25) | 0.9 s +7-3 |
| 266 | 266.12679(18) | 1.7 s +82-8 |
| 267 | 267.12750(28) | 17 s +14-6 |
| 270 | 270.13336(31) | 60 s +29-3 |
| 272 | 272.13826(58) | 10 s +12-4 |
| 274 | 274.14355(65) | 0.9 m +42-4 |
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)
