51Sb121.760
Metalloidp-block
Antimony
Element 51 on the periodic table, symbol Sb, group 15, period 5.
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.
Appearance: silvery lustrous gray
Properties
- Atomic Number
- 51
- Atomic Mass
- 121.7601 u
- Group
- 15
- Period
- 5
- Block
- p-block
- Category
- Metalloid
- State at 25 °C
- Solid
- Melting Point
- 903.8 K · 630.6 °C
- Boiling Point
- 1,908 K · 1,634.9 °C
- Density
- 6.697 g/cm³
- Atomic Radius
- 145 pm
- Electronegativity
- 2.05
- Oxidation States
- -3, +3, +5
- Abundance in Crust
- 0.2 mg/kg
- Discovered
- Known since antiquity
- Discovered By
- No individual credited
Electron Configuration
[Kr] 4d10 5s2 5p3
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p3
Ionisation Energies (kJ/mol)
- 1. 834
- 2. 1,594.9
- 3. 2,440
- 4. 4,260
- 5. 5,400
- 6. 10,400
Elements near Antimony
Elements in the same group share the number of outer electrons and behave in similar ways. Elements in the same period share a shell, so they change steadily from left to right.