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Copernicium (Cn)

From Wikipedia, the free encyclopediaCopernicium is a chemical element with symbol Cn and atomic number 112. It is an extremely radioactive synthetic element that can only be created in a laboratory. The most stable known isotope, copernicium-285, has a half-life of approximately 29 seconds, but it is possible that this copernicium isotope may have a nuclear isomer with a longer half-life, 8.9 min.

Copernicium in the periodic table

SymbolCn
Atomic number112
Group12
Period7
Blockd
Element categoryTransition Metal

Physical properties

Phase at STPGas
Density23.7 g/cm3
Atomic weight285 u
Melting point-
Boiling point3570 K
3296.85 °C
5966.33 °F

Atomic properties

Electronegativity (Pauling Scale)
Electron affinity kJ/mol
Oxidation states0, (+1), +2, (+4)
(parenthesized: prediction)
Ionization energies
11154.9 kJ/mol
22170.0 kJ/mol
33164.7 kJ/mol
44245.4 kJ/mol
55499.7 kJ/mol

Electron configuration

Elektronkonfiguration (shorthand)[Rn] 5f14 6d10 7s2
Electron configuration1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f14 6s2 6p6 6d10 7s2
Electrons per shell2, 8, 18, 32, 32, 18, 2

History

Discovered1996
Discovered byGesellschaft für Schwerionenforschung
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