WordNet (r) 3.0 (2006):

ununbium
    n 1: a radioactive transuranic element [syn: ununbium, Uub,
         element 112, atomic number 112]

The Elements (07Nov00):

ununbium
Symbol: Uub
Atomic number: 112
Atmic weight: 285
Ununbium is a IUPAC systematic element name, used until the element
receives an accepted name.
Ununbium was first created by the GSI in 1996, who have now proposed
the permanent name copernicium and the symbol Cn. This name is expected
to be officially endorsed by IUPAC in January 2010, after six months for
discussion. Element 112 is currently the highest-numbered element to be
officially recognised by IUPAC.
The most stable isotope discovered to date is 285Uub with a half-life
of ~30 s. In total, about 75 atoms of ununbium have been detected using
various nuclear reactions. An unconfirmed isotope, 285bUub, has a
possible
half-life of ~9 minutes, and would be one of the longest-lived
superheavy
isotopes known to date.
Recent experiments strongly suggest that ununbium behaves as a typical
member of group 12, demonstrating properties consistent with a volatile
metal.