Br2 - Diatomic Bromine

What is Diatomic Bromine?

Bromine compound is a molecule formed when two bromine atoms combine together. Bromine (Br2) is a red-brown liquid at ordinary temperature. It is very volatile. It gives very dense red-brown vapours that are highly toxic to mucous membranes. Bromine is purified from the salts taken from rocks and seawater. It is sold as salts or other compounds because pure bromine is expensive and difficult to produce. Bromine was discovered by French chemist Antoine J.Balard in 1826.

Other names – Dibromine, Bromine solution

Br2 Bromine
Density 3.1023 at 77 ° F
Molecular Weight/ Molar Mass 159.808 g/mol
Boiling Point 139.2 ° F at 760 mm Hg
Melting Point 19 ° F
Chemical Formula Br-Br

Diatomic Bromine Structure – Br2


Diatomic Bromine Structure

Physical Properties of Diatomic Bromine – Br2

Odour Pungent odour
Appearance Red to amber coloured gas
Covalently-Bonded Unit 1
Heavy Atom Count 2
Oxidation State -1
Solubility in water 0.33 mg/ mL.

Chemical Properties of Diatomic Bromine – Br2

    • Bromine reacts with sodium carbonate forms sodium bromide, sodium bromate and carbon dioxide.

3Br2 + 3Na2CO3 → 5NaBr + NaBrO3 + 3CO2

    • Bromine dissolves in water forming hydrogen bromide and Hypobromous acid. The chemical equation is given below.

Br2 + H2O → HBr + HBrO

Uses of Diatomic Bromine – Br2

  • Used in gold mining extraction processes and in oil- and gas-well drilling.
  • Compounds with 32% bromine are used in textile coatings, spray-bonded nonwovens, adhesives, and fibres.
  • Used in the manufacture of flame-retardant materials used most commonly in markets.
  • Bromine is used mostly for the production of organic compounds and for analytical purposes.

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