Bromine is the only liquid nonmetallic element at room temperature. It is a heavy, reddish-brown liquid, that evaporates easily. It is mostly obtained from sea water, where it occurs in small quantities.
A common use of bromine was in the production of 1,2-dibromoethane which in turn was used as an anti-knock agent for leaded petrol. This use has been largely discontinued with the switch to unleaded fuels.