Americium

Actinide · 243.061380 u · group 3, period 7

Americium · Am

Atomic number95

SymbolAm

CategoryActinide

Standard stateSolid

Group · Period · Block3 · 7 · f

Electron configuration[Rn]7s2 5f7

Atomic mass243.061380 u

Atomic radius244 pm

Protons / Neutrons / Electrons95 / 148 / 95

Shells (e⁻ per shell)2, 8, 18, 32, 25, 8, 2

Electronegativity (Pauling)1.3

Ionization energy5.993 eV

Electron affinity—

Oxidation states+6, +5, +4, +3

Melting point1.45e+3 K · 1.18e+3 °C

Boiling point2.28e+3 K · 2.01e+3 °C

Density13.69 g/cm³

Year discovered1944

CPK color

#545CF2

State at room temp (25 °C)

solid

Position