Ununquadium

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Ununquadium (Listeni /n.n.ˈkwɒdiəm/ oon-oon-KWOD-ee-əm)[1] is the temporary name of a radioactive chemical element with the temporary symbol Uuq and atomic number 114.

About 80 decays of atoms of ununquadium have been observed to date, 50 directly and 30 from the decay of the heavier elements ununhexium and ununoctium. All decays have been assigned to the four neighbouring isotopes with mass numbers 286-289. The longest-lived isotope currently known is 289Uuq with a half-life of ~2.6 s, although there is evidence for an isomer, 289bUuq, with a half-life of ~66 s, that would be one of the longest-lived nuclei in the superheavy element region.

Initial chemical studies have strongly indicated that ununquadium possesses non-'eka'-lead properties and appears to behave as the first superheavy element that portrays noble-gas-like properties due to relativistic effects.[2] However, more recent experiments using a different set-up have indicated that ununquadium might have metallic properties.[citation needed]

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