Polyatomic Ion Definition and Examples

What Is a Polyatomic Ion in Chemistry?

This is the chemical structure of the pyrophosphate anion, an example of a polyatomic ion.
This is the chemical structure of the pyrophosphate anion, an example of a polyatomic ion. Todd Helmenstine

Polyatomic Ion Definition

A polyatomic ion is an ion comprised of two or more atoms.

Examples: The hydroxide cation (OH-) and the phosphate cation (PO43-) are both polyatomic ions.