NO. 017Halogen

Cl

Chlorine

Chlorine is a greenish-yellow halogen gas with strong disinfecting properties. It is widely used in water purification, sanitation, and chemical manufacturing. Chlorine is highly reactive and toxic in high concentrations, requiring careful handling in industrial applications.

Crystal Structure

Orthorhombic

Technical Specifications

Atomic Mass35.45 u

Density0.003214 g/cm³

Melting Point171.6 K

Boiling Point239.11 K

Atomic Radius99 pm

Electronegativity3.16

Ionization Energy1251 kJ/mol

Electron Affinity349 kJ/mol

Bonding TypeCovalent

Oxidation States-1, 1, 3, 5, 7

Acid/BaseAcidic

ReactivityHigh

Electron Configuration

[Ne] 3s2 3p5

Discovered ByCarl Wilhelm Scheele

Year1774

Known Isotopes

Chlorine-35Chlorine-37