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Element Fact
In 1961, the International Union of Pure and Applied Chemistry adopted the isotope carbon-12 as the basis of atomic weight, which has a mass of exactly 12.000 atomic mass unit.

Americium, Am

americium sample

Atomic number: 95
Atomic mass: [243] (no stable nuclide)
Natural abundance: -
Isotopes: -

History and Production

The name is derived from Americas. It was first produced in 1944 by G.T. Seaborg, R.A. James, L.O. Morgan and A. Ghiorsoas the result of successive bombardment of neutron on 239Pu. The metal can be produced by reduction of americium fluoride (AmF3) with barium. 241Am is used as a portable source for gamma radiography. It has also been used as a radioactive glass thickness gauge for the flat glass industry and as a source of ionization for smoke detectors.

Physical Data

It is silvery radioactive metal that slowly tarnishes in air. It appears to be more malleable than uranium and neptunium. Americium is thought to exist in two allotropic forms.

Interatomic distance: -
Melting point: 1176C
Boiling point: 2011C
Thermal conductivity/Wm-1K-1: 10 est. (27C)
Density/kgm-3: 13670 (20C)

Standard Thermodynamic Data (atomic gas)

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

Electronic data

Electronic configuration: [Rn] 5f7 7s2
Term symbol: 8S7/2
Electron affinity: -   Electronegativity (Pauline): -
Ionization energy (first, second, third): 576.384, -, - kJ/mol

Chemical properties

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