Relative atomic mass: [243]

English: Americium
French: Americium
Croatian: Americij
German: Americium
Italian: Americio
Spanish: Americio

Atomic number: 95
Group numbers: 3
Period: 7
Standard state (20 oC): solid

Discovery: 1944 Glenn T. Seaborg, Ralph A. James, Leon O. Morgan, Albert Ghiorso (US)
Americium was discovered by Glenn T. Seaborg, Ralph A. James, Leon O. Morgan, and Albert Ghiorso (US) in 1944. Named for the American continent. It is a silvery-white, artificially produced radioactive metal. Americium was produced by bombarding plutonium with neutrons. Americium-241 is currently used in smoke detectors.
Electronic configuration: [Rn] 5f7 7s2
Formal oxidation number: +3 +4 +5 +6
Atomic radius: 173 pm

Electronegativities: -
Thermal conductivity: 10 W/(m K)
Electrical resistivity (20 oC): 68 microOhm cm

Melting point: 1176 oC
Boiling point: 2011 oC

Heat of fusion: 14.4 kJ/mol
Heat of vaporization: 238.5 kJ/mol
Heat of atomization: 266 kJ/mol

94Pu <= 95Am => 96Cm

ASCII Periodic Table of the Elements
29 Aug. 2017
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