Atomic number 95
Name Americium
Atomic mass 243
Electronic configuration [Rn] 5f7 7s2
Electronegativity 1.3
Atomic radius pm
Ion radius 126 (+2) pm
Van der Waals radius pm
Ionization energy 578 kJ/mol
Electron affinity kJ/mol
Oxidation states 2, 3, 4, 5, 6
Standard physical state solid
Bonding type metallic
Melting point 1449 °C
Boiling point 2284 °C
Density g/cm³
Type actinoid
Year discovered 1944