Periodic Table of the elements main page

Periodic Table

science park

Table of Elements

Chemical information

Science dictionary

scientific data

Site map

Gifts and souvenirs

printable version

go to periodic table










Education Billboard - meet and serve your education needs

Element Fact
There are around 120 known elements. Of these, 91 elements occur naturally on Earth. The rest no longer exist or are found only in traces as intermediate decay products alongside with other radioisotopes.

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

| Copyright | Privacy | Disclaimer | Contact |

2004-2010, all rights reserved.