Flevorium

General properties
Name, symbol, number	flerovium, Fl, 114
Element category	unknown
Group, period, block	14, 7, p
Standard atomic weight	(289)
Electron configuration	[Rn] 5f14 6d10 7s2 7p2 (predicted) 2, 8, 18, 32, 32, 18, 4 (predicted)
History
Discovery	Joint Institute for Nuclear Research and Lawrence Livermore National Laboratory (1999)

Flevorium is the radioactive chemical element with the symbol Fl and atomic number 114. The element is named after Russian physicist Georgy Flyorov, the founder of the Joint Institute for Nuclear Research in Dubna, Russia, where the element was discovered. The name was adopted by IUPAC on May 30, 2012.

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 ²⁸⁹Fl with a half-life of ~2.6 s, although there is evidence for a nuclear isomer, ^289bFl, with a half-life of ~66 s, that would be one of the longest-lived nuclei in the superheavy element region.

Chemical studies performed in 2007–2008 indicate that flerovium is unexpectedly volatile for a group 14 element; in preliminary results it even seemed to exhibit noble-gas-like properties due to relativistic effects.

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