The chemical element that is liquid at room temperature and has the symbol Br is bromine.
Bromine is a reddish-brown halogen with atomic number 35. It is one of only two elements that are liquids near ordinary room temperature; the other is mercury. Bromine is distinctive because it forms a volatile liquid rather than a gas like chlorine or a solid like iodine under typical conditions.
The name bromine comes from the Ancient Greek word bromos, meaning stench, referring to its strong and unpleasant odor. Bromine was independently discovered in 1826 by Antoine Jérôme Balard and Carl Jacob Löwig.
Bromine compounds have been used in flame retardants, photography, medicines, and water treatment. Elemental bromine is hazardous and corrosive, so its industrial uses generally involve controlled chemical compounds rather than open handling of the pure element.