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Bromine (Br)

A nonmetallic usually univalent or pentavalent element that lies between chlorine and iodine in the halogen group of the periodic table. Bromine has been used in swimming pools for disinfection and in cooling towers as a biocide, but its use in drinking water as a primary disinfectant has been limited because of uncertain effectiveness in the presence of organic material, ammonia, and other amines.