Curium

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

Property	Value
Atomic Number	96
Element	Curium
Symbol	Cm
Atomic Mass	[247] (most stable isotope)
Number of Neutrons	151 (Curium-247)
Number of Protons	96
Number of Electrons	96
Period	7
Group	Actinide (no fixed group number)
Phase	Solid
Radioactive	Yes
Natural	No (synthetic element)
Metal	Yes
Nonmetal	No
Metalloid	No
Type	Actinide
Atomic Radius	~174 pm (estimated)
Electronegativity	1.28 (estimated)
First Ionization Energy	5.991 eV (estimated)
Density	13.51 g/cm³
Melting Point	1340 °C
Boiling Point	3110 °C (estimated)
Number of Isotopes	No stable isotopes (Cm-247, Cm-248 most notable)
Discoverer	Glenn T. Seaborg, Ralph A. James, Albert Ghiorso
Year	1944
Specific Heat	— (not well established)
Number of Shells	7
Number of Valence Electrons	6