Ununbium is a metal in Group IIB and the 7th period. It is a synthetic element; none occurs naturally on earth.
The element was discovered by Siguard Hoffmanin 1996. The name Ununbium and the symbol Uub are both temporary names suggested by the IUPAC.
Uub is synthetic, just as are are all other elements beyond U. It was been made by bombarding lead with high-energy Zinc ions.
273Uun has a half-life of 0.001 seconds (as an alpha emitter).
Only one atom of Uub has ever been detected, and this atom only existed for a fraction of a second, so little is known about the chemistry of the element. It is expected to have properties similar to Mercury.