* Iron(II) Sulfate indicates that the iron ion has a +2 charge. The Roman numeral II in the name explicitly states the oxidation state.

* The sulfate ion (SO₄²⁻) has a charge of -2.

* To maintain neutrality in the compound, the iron ion must have a +2 charge to balance the -2 charge of the sulfate ion.

Therefore, the oxidation state of Fe in FeSO₄ is +2.