- Atomic Radius (Å)
Antimony is a chemical element with symbol Sb (from Latin:stibium) and atomic number 51. A lustrous gray metalloid, it is found in nature mainly as the sulfide mineral stibnite (Sb2S3). Antimony compounds have been known since ancient times and were used for cosmetics; metallic antimony was also known, but it was erroneously identified as lead upon its discovery.
51 Atomic Number
121.76 Atomic Mass (u)
904.05 Melting Point (K)
1860 Boiling Point (K)
6.7 Density (solid: g/cm³, gas: g/liter)
1.5 Atomic Radius (Å)
1.39 Covalent Radius (Å)
2.05 Electronegativity
8.61 First Ionization Energy (eV)
101.06 Electron Affinity
5 Number of Shells
5 Electron Valency
2, 8, 18, 18, 5 Electron Shell Occupations
0.21 Specific Heat (J/g)