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Antimony (Sb)
Atomic number 51 · Metalloid
| Atomic number | 51 |
|---|---|
| Atomic mass | 121.76 u |
| Molar mass | 121.76 g/mol |
| Category | Metalloid |
| Group / period / block | 15 / 5 / p |
| Electron configuration | [Kr] 4d10 5s2 5p3 |
| Electrons per shell | 2, 8, 18, 18, 5 |
| Electronegativity (Pauling) | 2.05 |
| Atomic radius | 145.0 pm |
| Density | 6.68 g/cm³ |
| First ionisation energy | 8.6084 eV |
| Melting point | 903.78 K (630.63 °C) |
| Boiling point | 1860.15 K (1587.00 °C) |
| Common oxidation states | -3, +3, +5 |
| Abundance in Earth's crust | 0.2 ppm |
Uses
Flame retardants, lead-acid batteries
Discovery
Known since ancient times