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Element 95 - Americium (Am) sound

Named after the Americas, by analogy with the rare earth Europium; discovered 1944. Americium is produced by bombarding plutonium with neutrons. It has been made in gram quantities which, in the world of such elements, is virtually a superabundance.

Properties

Atomic Number: 95
Atomic Weight: (243)
Electron Configuration (at ground state): 1s22s22p63s23p63d104s24p64d105s25p64f145d105f76s26p67s2
Oxidation States (Bold most stable): +6, +5, +4, +3
Boiling Point (K): 2880
Melting Point (K): 1449
Density (at 300K -- g/cm3): 13.7
Atomic Volume (at 300K -- cm3/mol) 20.8
Mass Number (Bold naturally occurring) -- Half-Life -- Disintigration Type: 241 -- 432 years -- alpha particle emission
243 -- 7.37 x 103 years -- alpha particle emission
Atomic Radius (Å): 1.84
First Ionization Potential (V): 6.0
Electronegativity (Pauling's): 1.3
Electrical Conductivity (at 293K for polycrystalline material -- 106 (ohms)-1 cm-1): 0.7
Thermal Conductivity (at 300K -- W m-1 K-1): 10
Crystal Structure: Hexagonal
Acid-Base Properties: Amphoteric