51 Sb
Metalloid
Antimony
Used in flame retardants.
Properties of Antimony
- Atomic number (Z)
- 51
- Symbol
- Sb
- Atomic mass
- 121.76 g/mol
- Category
- Metalloid
- Group
- 15
- Period
- 5
- Electron configuration
- [Kr] 4d¹⁰ 5s² 5p³
- Electronegativity (Pauling)
- 2.05
- Atomic radius
- 133 pm
- First ionization energy
- 834 kJ/mol
- Melting point
- 903.78 K (630.6 °C)
- Boiling point
- 1860 K (1586.8 °C)
- Density
- 6.685 g/cm³
- Phase at 25 °C
- Solid
- Discovered
- Known since ancient times