(this element does not have any stable isotopes)
Atomic weight of the most stable isotope: 270.13429(27) u
| Isotope | Atomic weight/u | Half-life |
| 263 | 263.12852(14) | 0.74 ms +48-21 |
| 264 | 264.128357(31) | ≈ 0.8 ms |
| 265 | 265.129793(26) | 1.9 ms 2 |
| 266 | 266.130046(42) | 2.3 ms +13-6 |
| 267 | 267.13167(10) | 52 ms +13-8 |
| 268 | 268.13186(30) | 0.4 s +18-2 |
| 269 | 269.13375(13) | 9.7 s +93-3 |
| 270 | 270.13429(27) | 22 s |
| 273 | 273.14168(40) | 0.76 s +71-24 |
| 275 | 275.14667(63) | 0.15 s +27-6 |
| 277 | 277.15190(58) | 3 ms +15-1 |
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)
