Chapter 8, Problem 8QP

Which of the following compounds are likely to have ionic bonds?

$\begin{array}{l}\text{(a)}\text{CsCl}\\ \text{(b)}{\text{CaCl}}_{\text{2}}\\ \text{(c)}{\text{OCl}}_{\text{2}}\\ \text{(d)}{\text{NBr}}_{\text{3}}\\ \text{(e)}\text{}{\text{IF}}_{\text{5}}\end{array}$