Which of the following is true about the composition of ionic compounds?
a. they are composed of anions and cations
b. they are composed of anions only
c. they are formed from two or more nonmetallic elements
d. they are composed of cations only

a. They are composed of anions and cations

Explanation:

Ionic compounds are molecules in which the constituent atoms are connected by ionic bonds.

Ionic bonds are formed by the transfer of electrons from one atom to the other. The atom that loses electrons becomes positively charged and referred to as a cation. Whereas, the atom that gains electrons becomes negatively charged i.e. an anion.

For example, common salt (sodium chloride) NaCl is an ionic compound which is essentially Na⁺Cl⁻.

Thus, ionic compounds are composed of anions and cations.

the answer would be a

the answer to your question is c