Antimony (Sb) — Element 51: Properties & Data | Aladdin Scientific
Antimony(Sb) — Element 51
Antimony (Sb) is a metalloid with atomic number 51 and atomic mass 121.76. It has melting point 903.78 K (631 °C), boiling point 1860 K (1587 °C), density 6.685 g/cm³. It sits in group 15 and period 5 of the periodic table and has been known since antiquity.
Key facts
| Atomic mass | 121.7600 u |
|---|---|
| Electron configuration | [Kr]5s2 4d10 5p3 |
| Oxidation states | +5, +3, -3 |
| Electronegativity (Pauling) | 2.05 |
| Atomic radius (van der Waals) | 206 pm |
| Ionization energy | 8.64 eV |
| Electron affinity | 1.07 eV |
| Melting point | 903.78 K |
| Boiling point | 1860 K |
| Density | 6.685 g/cm³ |
| Standard state | Solid |
| Year discovered | Ancient |
Frequently asked questions
What is the electron configuration of antimony?
The ground-state electron configuration of antimony is [Kr]5s2 4d10 5p3.
What group and period is antimony in?
Antimony (Sb) is in group 15 and period 5 of the periodic table, classified as a metalloid.
What is the melting point of antimony?
Antimony melts at 903.78 K (631 °C).
What is the standard state of antimony?
Antimony is a solid at standard temperature and pressure.
Related elements
About this data: property values compiled from IUPAC Standard Atomic Weights (2021), the NIST Atomic Spectra Database, and PubChem. Curated by the Aladdin Scientific technical team. Last reviewed: .