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Tb

Dy

Ho

Bk

Cf

Es

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Element Fact
Gold is the most ductile element. One gram of gold can be drawn to 2.4 km.

Californium, Cf

californium sample

Atomic number: 98
Atomic mass: [251] (no stable nuclide)
Natural abundance: -
Isotopes: -

History and Production

Derived from the state California. It was first produced in 1950 by S.G. Thompson, K. Street, A. Ghiorso and G.T. Seaborg, by bombarding microgram quantities of 242Cm with high energy helium ions. To date, production of the element has not been accomplished, although few compounds in very small amounts have been prepared. The 252Cf is a strong neutron emitter and has been used as a neutron source for gold and silvery discovery, in determining water and oil-bearing layers in oil explorations. A small amount of the isotope is used for cancer research.

Physical Data

It is a radioactive metal, probably silvery in appearance. It is a biological hazard, due to its strong neutron emission.

Interatomic distance: -
Melting point: 900C
Boiling point: n/a
Thermal conductivity/Wm-1K-1: 10 est. (27C)
Density/kgm-3: n/a

Standard Thermodynamic Data (atomic gas)

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

Electronic data

Electronic configuration: [Rn] 5f10 7s2
Term symbol: 5I8
Electron affinity: -   Electronegativity (Pauline): -
Ionization energy (first, second, third): 606.092, -, - kJ/mol

Chemical properties


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