Bromine is an element and the only non-metal in the Periodic Table that is a liquid at room temperature. It has 35 for its atomic number; a Bromine atom has 35 protons and electrons, and its mass number is 80; a Bromine atom has 45 neutrons. Its atomic symbol is Br.
Bromine was discovered by the scientists Carl Jacob Löwig and Antoine Balard in 1826; the latter called it a «peculiar substance in sea water.»
Bromine is diatomic; any sample of Bromine is made out of a molecule with two Bromine atoms. Bromine reacts with both metals and nonmetals.
Bromine forms many compounds like Sodium Bromide and Potassium Bromide. The most well-known Bromine compound is probably the pH indicatorBromothymol Blue.