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Americium

Metal radioactivesyntheticsolid
Symbol: Am
Atomic number: 95
Atomic mass: (243.0614)
Group: Actinide
CAS-number: 7440-35-9

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Physical data
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Physical data

Electronic dataThermal dataSteric data
Shells: 2, 8, 18, 32, 25, 8, 2
Orbitals: [Rn] 5f7 7s2
Electronegativity: --, 1.2
1. Ionization potential: 5.993 eV
2. Ionization potential: -- eV
3. Ionization potential: -- eV
Oxidation states: 6, 5, 4, 3
Electrical conductivity: 0.022 10^6
Melting point: 994 °C
Boiling point: 2607 °C
Specific heat: 0.11 J/gK
Heat of fusion: 14.40 kJ/mol
Heat of vaporization: -- kJ/mol
Thermal conductivity: 0.1 W/cmK
Atomic radius: -- Å
Ionic radius: -- Å
Covalent radius: -- Å
Atomic volume: 17.86 cm³/mol
Density (293 K): 13.6 g/cm³
Crystal structure: hexagonal
hexagonal

Isotopes

NuclideAbundance [%]MassSpinHalflifeDecay modeDecay tree
240Am 0 240 3/2 2.12d EC, α View
241Am 0 241.057 5/2 432.7y α View
242Am 0 242 1 16.02h β-, EC View
242Amm 0 242 5 141y IT, α View
243Am 0 243.061 5/2 7.37E03y α View
244Am 0 244 6 10.1h β- View
245Am 0 245 5/2 2.05h β- View
246Am 0 246 7/2 39m β- View

Other info

Name origin:Named for the American continent, by analogy with europium.
Description:Silvery-white, artificially produced radioactive metal.
Discovered by:G.T.Seaborg, R.A.James, L.O.Morgan, A.Ghiorso
Year:1945
Place:United States
Sources:Produced by bombarding plutonium with neutrons.
Use(s):Americium-241 is currently used in smoke detectors.