There are two different isotopes of bromine atoms. under normal conditions, elemental bromine consists of br2 molecules, and the mass of a br2 molecule is the sum of the masses of the two atoms in the molecule. the mass spectrum of br2 consists of three peaks:

The two stable isotopes of bromine are Br-79 and Br-81. The peaks that will form on the mass spectrum of Br₂ will be of mass:

158- from the joining of two Br-79 atoms
160- from the joining of one Br-79 atom and one Br-81 atom
162- form the joining of two Br-81 atoms

The answer is b because c don't explain why the moths are on them and it isn't a because as we know only one species of moth does this

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