Copernicium

Koushik 26/06/2026 19:58:09 Updated 26/06/2026 19:58:09

Property	Value
Atomic Number	112
Element	Copernicium
Symbol	Cn
Atomic Mass	[285] (most stable isotope)
Number of Neutrons	173 (Copernicium-285)
Number of Protons	112
Number of Electrons	112
Period	7
Group	12
Phase	Liquid or Gas (predicted, due to relativistic effects)
Radioactive	Yes
Natural	No (synthetic element)
Metal	Yes (may behave like a noble metal)
Nonmetal	No
Metalloid	No
Type	Transition Metal
Atomic Radius	— (not well established)
Electronegativity	— (not well established)
First Ionization Energy	~9.0 eV (estimated)
Density	~23.7 g/cm³ (estimated)
Melting Point	~10 °C (estimated)
Boiling Point	~67 °C (estimated)
Number of Isotopes	No stable isotopes (Cn-285 most notable)
Discoverer	Gesellschaft für Schwerionenforschung (GSI), Germany
Year	1996
Specific Heat	— (not well established)
Number of Shells	7
Number of Valence Electrons	12