Iron pyrophosphate is a chemical compound with the formula Fe₂P₂O₇. This means it is composed of the following elements:

* Iron (Fe): This is a transition metal that makes up the majority of the compound.

* Phosphorus (P): This is a nonmetal that forms the phosphate group (PO₄).

* Oxygen (O): This is another nonmetal that bonds with phosphorus to form the phosphate group.

Therefore, iron pyrophosphate contains iron, phosphorus, and oxygen.