Periodic Table of Elements




Antimony in the form of Antimony(III) sulfide, Sb2S3 was known to the ancients as early as about 3100 BC and was used by them as an eye cosmetic. Antimony was discovered by Basil Valentine of Germany in 1450. Basil Valentine described its preparation in his work "Triumphal Chariot of Antimony" published in 1604.

Name: Antimony
Symbol: Sb
Atomic number: 51
Atomic weight: 121.76
State: solid
Group, period, block: 15, 5, p
Color: silvery lustrous gray
Classification: metalloid
Electron configuration: 4d10 5s2 5p3

Physical properties

Density: 6.697 g/cm-3
Melting point: 903.78 K, 630.63 C, 1167.13 F
Boiling point: 1860 K, 1587 C, 2889 F

Atomic properties

Oxidation states: 5, 3, -3
Electronegativity: 2.05 (Pauling scale)
Ionization energies: 1st: 834 kJmol-1
Covalent radius: 1395 pm
Van der Waals radius: 206 pm
  • Sb
  • Electron Configuration


There are two naturally occurring isotopes of antimony exist, 121Sb, and 123Sb.