Final answer:
CaBr2, which is C₅H₁₀BrNO, is an ionic compound because it contains a metallic element (calcium) and a nonmetallic element (bromine).
Step-by-step explanation:
Compounds between metal and nonmetal elements are usually ionic.
For example, CaBr2 contains a metallic element (calcium, a group 2 [or 2A] metal) and a nonmetallic element (bromine, a group 17 [or 7A] nonmetal).
Therefore, it is most likely an ionic compound (in fact, it is ionic).
In contrast, the compound NO2 contains two elements that are both nonmetals (nitrogen, from group 15 [or 5A], and oxygen, from group 16 [or 6A]. It is not an ionic compound; it belongs to the category of covalent compounds discussed elsewhere.