Atomic Properties
- Atomic Number
- 51
- Atomic Mass
- 121.7600 u
- Electron Configuration
- [Kr] 4d10 5s2 5p3
- Electronegativity
- 2.05
- Block
- p-block
- Group
- 15
- Period
- 5
Physical Properties
- Phase (STP)
- solid
- Melting Point
- 903.78 K
- Boiling Point
- 1908.00 K
- Density
- 6.6970 g/cm³
About Antimony
Brittle metalloid; used in flame retardants and lead-acid batteries.
Why "Sb" for Antimony?
Sb←Stibium(Latin)
The symbol Sb comes from "Stibium," the Latin name derived from Greek "stibi" referring to the mineral stibnite. The name "Antimony" has uncertain origins, possibly from Greek "anti-monos" (not alone) as it's rarely found pure.
Isotopes of Antimony
Antimony has 2 naturally occurring isotopes.
| Isotope | Mass Number | Atomic Mass (u) | Abundance | Type |
|---|---|---|---|---|
| 121Sb | 121 | 120.903812 | 57.21% | Stable |
| 123Sb | 123 | 122.9042132 | 42.79% | Stable |
Data source: NIH PubChem (aggregated from IUPAC, NIST)