Metalloid

Antimony

Antimony (Sb) has atomic number 51. PubChem classifies it as metalloid.

Atomic number

51

Symbol

Sb

Atomic weight (source value)

121.760

Electron configuration

[Kr]5s2 4d10 5p3

Standard state

Solid

Electronegativity (Pauling)

2.05

Melting point (K)

903.78

Boiling point (K)

1860

Density (g/cm³)

6.685

Oxidation states

+5, +3, -3

Understanding this entry

Atomic number is the number of protons in the nucleus. Properties are reference values and may depend on conditions and measurement conventions. An atomic weight is not the mass of every isotope. For elements without a standard atomic weight, a source may report an isotope mass number. Blank source values are shown as unavailable rather than estimated.

Further reading and reference: NIH PubChem source dataset ↗. Values and educational summaries are not a substitute for specialised advice.