NO. 051Metalloid

Sb

Antimony

Antimony is a brittle metalloid used in flame retardants, alloys, and semiconductors.

Crystal Structure

Rhombohedral

Atomic Mass121.76 u

Density6.68 g/cm³

Melting Point904 K

Boiling Point1860 K

Atomic Radius133 pm

Electronegativity2.05

Ionization Energy834 kJ/mol

Electron Affinity101 kJ/mol

Bonding TypeCovalent

Oxidation States-3, 3, 5

Acid/BaseCan act as acid or base

ReactivityMedium

Electron Configuration

[Kr] 4d10 5s2 5p3

Discovered ByAncient civilizations

Year-1600

Known Isotopes

Sb-121Sb-123