Here are some examples:

* Nitrate (NO₃⁻): Composed of one nitrogen atom and three oxygen atoms with a negative charge.

* Sulfate (SO₄²⁻): Composed of one sulfur atom and four oxygen atoms with a negative charge.

* Ammonium (NH₄⁺): Composed of one nitrogen atom and four hydrogen atoms with a positive charge.

* Phosphate (PO₄³⁻): Composed of one phosphorus atom and four oxygen atoms with a negative charge.

* Carbonate (CO₃²⁻): Composed of one carbon atom and three oxygen atoms with a negative charge.

Polyatomic ions are common in many chemical compounds and play a crucial role in various chemical reactions.