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.
Experiment with the elements
Antimony doesn't form any compounds in our lab yet, but the periodic table sandbox lets you combine dozens of other real elements into real compounds — water, table salt, ammonia and many more — with their true chemical formulas.