Samarium

Lanthanide · 150.4 u · group 3, period 6

Samarium · Sm

Atomic number62

SymbolSm

CategoryLanthanide

Standard stateSolid

Group · Period · Block3 · 6 · f

Electron configuration[Xe]6s2 4f6

Atomic mass150.4 u

Atomic radius229 pm

Protons / Neutrons / Electrons62 / 88 / 62

Shells (e⁻ per shell)2, 8, 18, 24, 8, 2

Electronegativity (Pauling)1.17

Ionization energy5.644 eV

Electron affinity—

Oxidation states+3, +2

Melting point1.35e+3 K · 1.07e+3 °C

Boiling point2.07e+3 K · 1.79e+3 °C

Density7.52 g/cm³

Year discovered1879

CPK color

#8FFFC7

State at room temp (25 °C)

solid

Position