Why chloride and bromine are not likely to form an ionic bond?

Answer 1

Chloride and bromine are not likely to form an ionic bond because only one of them, chloride, is an ion.

If the questioner meant chlorine and bromine, they are not likely to form an ionic bond with each other, because there is too little difference in their electronegativities. However, both of them are very likely to form ionic bonds with less electronegative elements, such as metals.