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Flerovio – FleroviumMass: 289u

[Rn] 5f14 6d10 7s2 7p2 Melting point: 340 k Boiling point: 420 k

Density (predicted): 22 g·cm-3

Discovery: Joint Institute and Lawrence Livermore , 1999

About 80 decays of atoms of flerovium have been observed to date, 50 directly and 30 from the decay of the heavier elements livermorium and ununoctium. All decays have been assigned to the five neighbouring isotopes with mass numbers 285–289. The longest-lived isotope currently known is Fl with a half-life of ~2.6 s, although there is evidence for a nuclear isomer, Fl, with a half-life of ~66 s, that would be one of the longest-lived nuclei in the superheavy element region.