Wikipedia describes Bromine as a fuming red-brown and one of two elements that are liquid liquid at room temperature. It is toxic and corrosive and although found in the body in trace amounts was not thought to be useful in human metabolism. Its main role appears to be in the immune system, combining to create a toxic response to various viral and bacterial invaders.
Isolated in 1825, Bromine has become an industrial product used in pharmaceuticals, agriculture and flame retardants, among other things. Bromine as a gas is a major chemical responsible for the degradation of the ozone layer in Antarctica. A large portion of this comes from agricultural herbicides and pesticides.
Here is the Bromine Scale.
This is a short sound sketch of the tones of Bromine.