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.
This entity has been manually annotated by the ChEBI Team.
The name copernicium was submitted for IUPAC approval in July 2009. The initially proposed symbol Cp was subsequently changed to Cn when potential confusion with the previous associatiation with the name cassiopeium (cassiopium, now known as lutetium) was raised.