Isotopes of copernicium

Copernicium (112Cn) is a synthetic element, and thus a standard atomic weight cannot be given. Like all synthetic elements, it has no stable isotopes. The first isotope to be synthesized was 277Cn in 1996. There are 6 known radioisotopes (with one more unconfirmed); the longest-lived isotope is 285Cn with a half-life of 30 seconds.

Isotopes of copernicium (112Cn)
Main isotopes Decay
abun­dance half-life (t1/2) mode pro­duct
283Cn synth 3.81 s α96% 279Ds
SF4%
ε? 283Rg
285Cn synth 30 s α 281Ds
286Cn synth 8.4 s? SF
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