Antimony (Sb)
Antimony (Sb) is element 51 of the periodic table, a metalloid in period 5 and group 15. Its standard atomic weight is 121.76, so one mole of antimony atoms has a mass of 121.76 g. At room temperature it is a solid; it melts at 630.63 °C and boils at 1586.85 °C.
| Atomic number | 51 |
|---|---|
| Symbol | Sb |
| Standard atomic weight | 121.76 |
| Molar mass | 121.76 g/mol |
| Category | Metalloid |
| Group | 15 |
| Period | 5 |
| Block | p-block |
| Electron configuration | [Kr] 5s2 4d10 5p3 |
| Oxidation states | +5, +3, −3 |
| Electronegativity (Pauling) | 2.05 |
| Atomic radius (van der Waals) | 206 pm |
| First ionisation energy | 8.64 eV (833.6 kJ/mol) |
| Electron affinity | 1.07 eV |
| State at room temperature | Solid |
| Melting point | 903.78 K (630.63 °C) |
| Boiling point | 1860 K (1586.85 °C) |
| Density | 6.685 g/cm³ |
| Discovered | Known since antiquity |
Group 15
Calculate with Antimony
Atomic weight: IUPAC CIAAW standard atomic weight. Other properties: PubChem (U.S. National Library of Medicine, public domain). Values such as melting point and radius depend on how they were measured; check a data book for precise work.