The formula unit for the ionic compound, cuprous bromide, consists of which of the following?

? 1 Cu2+ ion and 2 Br- ions
? 1 Cu+ ion and 1 Br- ion
? 2 Cu+ ions and 1 Br2- ion
? 1 Cu- ion and 1 Br+ ion
? 1 Cu2+ ion and 1 Br2- ion

1 answer

The formula unit for cuprous bromide is composed of 1 Cu⁺ ion and 1 Br⁻ ion. This is because "cuprous" refers to the +1 oxidation state of copper (Cu), while bromide (Br) has a -1 charge.

Therefore, the correct answer is:

? 1 Cu⁺ ion and 1 Br⁻ ion