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

Question

? 1 Cs2+ ion and 2 Br- ions
? 1 Cs+ ion1 and 1 Br- ion
? 2 Cs+ ions and 1 Br2- ion
? 1 Cs2- ion and 2 Br+ ions
? 1 Cs3+ ion and 3 Br- ions

Answer 1

The correct formula unit for the ionic compound cesium bromide is:

1 Cs⁺ ion and 1 Br⁻ ion

This is because cesium (Cs) forms a +1 charge cation (Cs⁺) and bromide (Br) forms a -1 charge anion (Br⁻). Therefore, they combine in a 1:1 ratio to form CsBr.