Bromine is a chemical element with the symbol Br and atomic number 35. It is the third-lightest halogen, and is a fuming red-brown liquid at room temperature that evaporates readily to form a similarly coloured gas.
Its properties are thus intermediate between those of chlorine and iodine.
Bromine is used in many areas such as agricultural chemicals, dyestuffs, insecticides, pharmaceuticals and chemical intermediates.
Some uses are being phased out for environmental reasons, but new uses continue to be found.
Bromine compounds can be used as flame retardants.