NO. 035Halogen

Br

Bromine

Bromine is a reddish-brown liquid halogen used in flame retardants and chemical synthesis.

Crystal Structure

Orthorhombic

Atomic Mass79.9 u

Density3.12 g/cm³

Melting Point266 K

Boiling Point332 K

Atomic Radius94 pm

Electronegativity2.96

Ionization Energy1140 kJ/mol

Electron Affinity324 kJ/mol

Bonding TypeCovalent

Oxidation States-1, 1, 5

Acid/BaseAcidic

ReactivityHigh

Electron Configuration

[Ar] 3d10 4s2 4p5

Discovered ByAntoine Jérôme Balard

Year1826

Known Isotopes

Br-79Br-81