Antimony
Antimony 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.
A stylized shell model. Electrons are quantum objects, not particles following these literal paths. Sizes and motion are illustrative.
36 is the [Kr] core total across four shells.
At a glance
- Atomic number
- 51
- Atomic mass
- 121.7601 u
- Phase
- Solid
- Density
- 6.697 g/cm³
- Melting point
- 903.78 K
- Boiling point
- 1,908 K
- First ionization energy
- 834 kJ/mol
- Electronegativity
- 2.05
- Electron affinity
- 101.059 kJ/mol
- Molar heat capacity
- 25.23 J/(mol·K)
- Period
- 5
- Appearance
- silvery lustrous gray
Conditions and isotopes affect measured properties. Some properties of short-lived elements are predicted. Electronegativity uses the Pauling scale.
Keep exploring
Explore the stories, imagery, and reference data in more depth. Properties with no value in the reference are marked unavailable.