Symbol: Am
Atomic Number: 95
Atomic Weight: 243.0614
Element Classification: Radioactive Rare Earth Element (Actinide Series)
Discovered By: G.T.Seaborg, R.A.James, L.O.Morgan, A.Ghiorso
Discovery Date: 1945 (United States)
Name Origin: Named for the American continent, by analogy with europium.
Density (g/cc): 13.67
Melting Point (K): 1267
Boiling Point (K): 2880
Appearance: Silvery-white, radioactive metal
Atomic Radius (pm): 173
Atomic Volume (cc/mol): 20.8
Covalent Radius (pm): n/a
Ionic Radius: 92 (+4e) 107 (+3e)
Specific Heat (@20°C J/g mol): n/a
Fusion Heat (kJ/mol): (10.0)
Evaporation Heat (kJ/mol): 238.5
Thermal Conductivity (@25°C W/m K):
Debye Temperature (K): n/a
Pauling Negativity Number: 1.3
First Ionizing Energy (kJ/mol): n/a
Oxidation States: 6, 5, 4, 3
Electronic Configuration: [Rn] 5f⁷ 7s²
Lattice Structure: n/a
Lattice Constant (Å): n/a
Lattice C/A Ratio: n/a