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Element Fact
Cesium is used in atomic clock. As in 1999, the best clock is accurate to a second in 20 million years.

Curium, Cm

curium sample

Atomic number: 96
Atomic mass: [247] (no stable nuclide)
Natural abundance: -
Isotopes: -

History and Production

The name is derived in honor of Pierre and Marie Curie. It was the third transuranium element to be discovered, after neptunium and plutonium. It was produced in 1944 by G.T. Seaborg, R.A. James and A. Ghiorso by bombardment of 239Pu with helium ion. There is no use for the element apart for research purposes. However, 242Cm has been suggested to be used as a power source.

Physical Data

It is a silvery radioactive metal. It is more electropositive than aluminium. The most stable isotope, 247Cm has a half-life of about 16 million years. It is thought that natural curium many exist in traces in uranium ores. It is radiologically highly toxic which readily accumulated in the bone.

Interatomic distance: -
Melting point: 1345C
Boiling point: n/a
Thermal conductivity/Wm-1K-1: 10 est. (27C)
Density/kgm-3: 13510 est.

Standard Thermodynamic Data (atomic gas)

Enthalpy of formation: -
Gibbs free energy of formation: -
Entropy: -
Heat capacity: -

Electronic data

Electronic configuration: [Rn] 5f7 6d1 7s2
Term symbol: 8S7/2
Electron affinity: -   Electronegativity (Pauline): -
Ionization energy (first, second, third): 578.092, -, - kJ/mol

Chemical properties

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