Copernicium (Cn) is an artificial element, and thus a standard atomic mass cannot be given. Like all artificial elements, it has no stable isotopes. The first isotope to be synthesized was 277Cn in 1996. There are 6 known radioisotopes and 2 possible isomers. The longest-lived isotope is 283Cn with a half-life of 4.2 minutes.
nuclide symbol |
Z(p) | N(n) | isotopic mass (u) |
half-life | decay mode(s)[n 1] |
daughter isotope(s) |
nuclear spin |
---|---|---|---|---|---|---|---|
excitation energy | |||||||
277Cn | 112 | 165 | 277.16394(14)# | 1.1(7) ms [0.69(+69-24) ms] |
α | 273Ds | 3/2+# |
281Cn | 112 | 169 | 281.16929(106)# | 10# s | α | 277Ds | 3/2+# |
282Cn | 112 | 170 | 282.16977(76)# | 30# s | SF | (various) | 0+ |
283Cn | 112 | 171 | 283.17179(83)# | 4 s | α (90%) | 279Ds | |
SF (10%) | (various) | ||||||
283mCn[n 2] | 5 min | SF | (various) | ||||
284Cn | 112 | 172 | 284.17238(91)# | 97 ms | SF | (various) | 0+ |
285Cn | 112 | 173 | 285.17411(78)# | 29 s | α | 281Ds | 5/2+# |
285mCn[n 2] | 8.9 min | α | 281Ds |
Isotopes of roentgenium | Isotopes of copernicium | Isotopes of ununtrium |
Index to isotope pages · Table of nuclides |