- 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 u Atomic Mass
904.05 K Melting Point
1860 K Boiling Point
6.7 g/cm³ Density
1.5 Å Atomic Radius
1.39 Å Covalent Radius
2.05 Electronegativity
8.61 eV First Ionization Energy
101.06 Electron Affinity
5 Number of Shells
5 Electron Valency
2, 8, 18, 18, 5 Electron Shell Occupations
0.21 J/g Specific Heat