* Iron (Fe) typically has a +2 or +3 charge in ionic compounds.

* Carbonate (CO₃) has a -2 charge.

To balance the charges, the correct formula for iron(II) carbonate is FeCO₃.

Iron(III) carbonate, on the other hand, would be Fe₂(CO₃)₃ because two iron(III) ions (+3 each) are needed to balance the charges of three carbonate ions (-2 each).