zinc group element atom copernicium atom chebi_ontology copernicium NaN 112Cn A zinc group element atom with a symbol Cn and atomic number 112. All its isotopes are intensely radioactive. Prior to its discovery, it had the placeholder name ununbium (in accordance with IUPAC recommendations). Following its discovery (in Darmstadt, 1996) and subsequent confirmation, the name copernicium was adopted in 2010. NOTIIDSZELDPOP-UHFFFAOYSA-N ununbium 112Cp Wikipedia:Copernicium CHEBI:33517 Cn 0 112Uub Uub InChI=1S/Cn Cn 0.00000 [Cn]