Antimony

Metalloid · 121.760 u · group 15, period 5

Antimony · Sb

Atomic number51

SymbolSb

CategoryMetalloid

Standard stateSolid

Group · Period · Block15 · 5 · p

Electron configuration[Kr]5s2 4d10 5p3

Atomic mass121.760 u

Atomic radius206 pm

Protons / Neutrons / Electrons51 / 71 / 51

Shells (e⁻ per shell)2, 8, 18, 18, 5

Electronegativity (Pauling)2.05

Ionization energy8.64 eV

Electron affinity1.07 eV

Oxidation states+5, +3, -3

Melting point903.8 K · 630.6 °C

Boiling point1.86e+3 K · 1.59e+3 °C

Density6.685 g/cm³

Year discoveredAncient

CPK color

#9E63B5

State at room temp (25 °C)

solid

Position

2 in library