(From the
Greek bromos, "
stench") A
chemical element, one of the
halogens, usually in the form of a reddish-brown,
corrosive liquid, that
volatilizes to form a
vapor that has an unpleasant odor and is very irritating to
mucous membranes. It is used in making
dyes, in
photography, and, in the form of certain
compounds, in
antiknock motor fuel.
Symbol: Br
Atomic number: 35
Atomic weight: 79.904
Density (at room temperature and pressure): 3.12 g/cc
Melting point: -7.2°C
Boiling point: 58.8°C
Valence: -1, +1, +5
Ground state electron configuration: [Ar]3d104s24p5