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Element Fact
Americium is one of the few radioactive elements that find its use in homes as a smoke detector.

Bohrium, Bh

bohrium sample

Atomic number: 107
Atomic mass: [264] (no stable nuclide)
Natural abundance: -
Isotopes: -

History and Production

Named after Niels Bohr (1885-1962), an atomic and nuclear pysicist. The discovery was first suggested in 1976 by scientists from Dubna, Russia (then Soviet Union), by bombarding 204Bi with 54Cr. More conclusive discovery was made by P. Armbruster and G. Münzenberg in 1981 using the Universal Linear Accelerator in Darmstadt, Germany. They repeated the experiment carried out by Dubna group in 1976. In 1983, the latter research group used the 157-inch cyclotron to produce 262Bh with a half-life of 0.1 second. The new element was assigned with the name bohrium by IUPAC in 1997.

Physical Data

Its physical properties are not known as only few atoms have been produced so far which quickly destroy the moment they are synthesized.

Interatomic distance: -
Melting point: n/a
Boiling point: n/a
Thermal conductivity/Wm-1K-1: n/a
Density/kgm-3: 37000 (est.)

Standard Thermodynamic Data (atomic gas)

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

Electronic data

Electronic configuration: Electronic configuration: [Rn] 5f14 6d5 7s2
Term symbol: 6S5/2
Electron affinity: -   Electronegativity (Pauline): -
Ionization energy (first, second, third): 660 (est.), -, - kJ/mol

Chemical properties


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