Naturally occurring bromine has a relative atomic mass of $80$ and is made up entirely of two isotopes with relative atomic masses $79$ and $81$. What conclusion can be drawn about naturally occurring bromine from this information alone?
- ABromine contains the two isotopes in equal proportions.
- BBromine has different oxidation states.
- CBromine isotopes have different numbers of protons.
- DBromine is radioactive.