51 Sb 121.76
Antimony
metalloid
Properties
- Atomic number
- 51
- Atomic mass
- 121.76 u
- Category
- metalloid
- Group
- 15
- Period
- 5
- Block
- p-block
- State (room temp)
- Solid
- Outer-shell electrons
- 5
- Electronegativity
- 2.05 (Pauling)
- Density
- 6.697 g/cm³
- Melting point
- 630.63 °C
- Boiling point
- 1634.85 °C
Electron configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p³
Noble-gas shorthand: [Kr] 4d¹⁰ 5s² 5p³
Electrons per shell: 2, 8, 18, 18, 5 — that's 5 in the outermost shell.
About Antimony
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.
- Discovered by unknown, before 3000 BC
- Appearance: silvery lustrous gray
Position in the periodic table
Data compiled from Wikipedia, PubChem, and IUPAC. Source.