* Lead(IV) ion (Pb⁴⁺): Lead in its +4 oxidation state is a metal cation.

* Sulfate ion (SO₄²⁻): Sulfate is a polyatomic anion composed of sulfur and oxygen.

Ionic bonds form between metals and nonmetals due to the electrostatic attraction between positively charged cations and negatively charged anions. In this case, the lead(IV) cation (Pb⁴⁺) is attracted to the sulfate anion (SO₄²⁻), forming an ionic bond.