Chlorine
Reactive Nonmetal
Chlorine (Cl) is a chemical element with atomic number 17, classified as a reactive nonmetal. At room temperature it is a gas. It was discovered in 1774 by Carl Wilhelm Scheele.
Properties
- Atomic number
- 17
- Atomic mass
- 35.45 u
- Category
- Reactive Nonmetal
- Group
- 17
- Period
- 3
- Block
- p-block
- Electron configuration
- [Ne] 3s² 3p⁵
- Phase at STP
- Gas
- Density
- 3.214 g/L
- Melting point
- 171.65 K (-101.5 °C)
- Boiling point
- 239.11 K (-34.0 °C)
- Electronegativity
- 3.16
- Atomic radius
- 79 pm
- Ionization energy
- 12.968 eV
- Discovery
- 1774 · Carl Wilhelm Scheele
Common uses
Water purification, bleach, PVC plastic, table salt
Did you know?
Poisonous gas that saves millions of lives by disinfecting drinking water.