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 is diatomic; any sample of Bromine is made out of a molecule with two Bromine atoms. Bromine reacts with both metals and nonmetals.