Curium is a silvery, radioactive metal that glows reddish purple in the dark. This element was discovered by Nobel laureate Glenn T. Seaborg. It was named after Nobel laureate Marie Curie, who discovered the element polonium. Several space probes use curium-containing X-ray devices.

Summary of properties (Cm)

Atomic weight[247]
Discoverer (year)Seaborg, Glenn T. (1944)
Natural formmetallic solid (hexagonal)
Electron configuration[Rn] 57 6d1 s2
Melting point (ºC)1340
Boiling point (ºC)
Abundance in earth's crust (ppm)synthetic
Isotope (abundance)
Density g/cm313.5
Van der Waals radius (pm)245
Covalent radius (pm)168
Electronegativity (Pauling)1.3
Vaporization enthalpy (kJ/mol)387.00
Enthalpy of fusion (kJ/mol)15.00
Specific heat capacity (J/g·K) at 25ºC and 1 atm-
Thermal conductivity (W/cm·K) at 25ºC and 1 atm-
Oxidation state+3
Electron affinity (eV)
1st Ionization potential (eV)5.9914

Back to the Periodic Table of the Elements.