Isotopes of seaborgium

Seaborgium (106Sg) is a synthetic element and so has no stable isotopes. A standard atomic weight cannot be given. The first isotope to be synthesized was 263Sg in 1974. There are 13 known radioisotopes from 258Sg to 271Sg and 4 known isomers (259mSg, 261mSg, 263mSg, and 265mSg). The longest-lived isotope is 269Sg with a half-life of 14 minutes.

Isotopes of seaborgium (106Sg)
Main isotopes Decay
abun­dance half-life (t1/2) mode pro­duct
265Sg synth 8.5 s α 261Rf
265mSg synth 14.4 s α 261mRf
267Sg synth 80 s α17% 263Rf
SF83%
268Sg synth 13 s SF
269Sg synth 14 min α 265Rf
271Sg synth 31 s α73% 267Rf
SF27%
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