Antimony
Metalloid
Antimony (Sb) is a chemical element with atomic number 51, classified as a metalloid. At room temperature it is a solid. It has been known since ancient times.
Properties
- Atomic number
- 51
- Atomic mass
- 121.76 u
- Category
- Metalloid
- Group
- 15
- Period
- 5
- Block
- p-block
- Electron configuration
- [Kr] 4d¹⁰ 5s² 5p³
- Phase at STP
- Solid
- Density
- 6.685 g/cm³
- Melting point
- 903.78 K (630.6 °C)
- Boiling point
- 1860 K (1586.8 °C)
- Electronegativity
- 2.05
- Atomic radius
- 133 pm
- Ionization energy
- 8.608 eV
- Discovery
- Known since ancient times
Common uses
Flame retardants, semiconductors, batteries, pewter
Did you know?
Used in ancient times as eye makeup and now in flame-retardant materials.