An ionic compound is typically made of a. two metals. b. two nonmetals. c. a metal and a nonmetal. d. none of the above.

. c. a metal and a nonmetal.

Explanation:

A covalent compound is formed when an element shares its valence electron with another element. This bond is formed between two non metals.  Example:

An ionic compound is formed when one element completely transfers its valence electron to another element. The element which donates the electron is known as electropositive element and the element which accepts the electrons is known as electronegative element. This bond is formed between a metal and an non-metal.  Example:

Thus an ionic compound is typically made of a metal and a nonmetal.

I hope you won't be solid on this answer, But I researched it with my colleagues, and we all agreed it's the amount of atoms in the compound. (I hope this was you question.)