Isotopes of roentgenium

Isotopes of roentgenium (111Rg)
Main isotopes[1] Decay
abun­dance half-life (t1/2) mode pro­duct
279Rg synth 0.09 s[2] α87% 275Mt
SF13%
280Rg synth 3.9 s α 276Mt
281Rg synth 11 s[3] SF86%
α14% 277Mt
282Rg synth 130 s α 278Mt
283Rg synth 5.1 min?[4] SF
286Rg synth 10.7 min?[5] α 282Mt

Roentgenium (111Rg) 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 272Rg in 1994, which is also the only directly synthesized isotope; all others are decay products of heavier elements. There are seven known radioisotopes, having mass numbers of 272, 274, and 278–282. The longest-lived isotope is 282Rg with a half-life of about 2 minutes, although the unconfirmed 283Rg and 286Rg may have longer half-lives of about 5.1 minutes and 10.7 minutes respectively.

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