Antimony (Sb)

From Wikipedia, the free encyclopediaAntimony is a chemical element with symbol Sb (from Latin:stibium) and atomic number 51. A lustrous gray metalloid, it is found in nature mainly as the sulfide mineral stibnite (Sb2S3). Antimony compounds have been known since ancient times and were used for cosmetics; metallic antimony was also known, but it was erroneously identified as lead upon its discovery.

Antimony in the periodic table

SymbolSb
Atomic number51
Group15
Period5
Blockp
Element categoryMetalloid

Physical properties

Phase at STPSolid
Density6.697 g/cm3
Atomic weight121.76 u
Melting point903.78 K
630.63 °C
1167.134 °F
Boiling point1908 K
1634.85 °C
2974.73 °F

Atomära egenskaper

Electronegativity (Pauling Scale)2.05
Electron affinity101.059 kJ/mol
Ionization energies
1834 kJ/mol
2 1594.9 kJ/mol
3 2440 kJ/mol
4 4260 kJ/mol
5 5400 kJ/mol
6 10400 kJ/mol

Electron configuration

Electron configuration1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p3
Electrons per shell2, 8, 18, 18, 5

History

Discovered815
Discovered byJabir ibn Hayyan