The molecular weight of bromine is about 79.90 atomic mass units. The atomic weight of an element such as bromine is located on the periodic table of elements below the element's symbol. For bromine, the symbol is Br.
The molecular weight is similar to the molar mass, which calculates the weight in grams per mole. For bromine, the molar mass is 79.9 grams per mole. For a compound containing more than one element, the molecular weight is calculated by adding together the atomic weights of each atom of each element in the compound. Bromine is a diatomic nonmetal in the halogen group. Its atomic number is 35.