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.
Atomic number: 51
Atomic weight: 121.76
Group, period, block: 15, 5, p
Color: silvery lustrous gray
Electron configuration: 4d10 5s2 5p3
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
Oxidation states: 5, 3, -3
Electronegativity: 2.05 (Pauling scale)
Ionization energies: 1st: 834 kJ·mol-1
Covalent radius: 139±5 pm
Van der Waals radius: 206 pm
There are two naturally occurring isotopes of antimony exist, 121Sb, and 123Sb.