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Three oxygen compounds of iron are known: ferrous oxide, FeO; ferric oxide, Fe2O3; and ferrosoferric oxide, or ferroferric oxide, Fe3O4, which contains iron in both +2 and +3 oxidation states. Ferrous oxide is a greenish to black powder used primarily as a pigment for glasses.
Rating Newest Oldest. Best Answer: Iron is a transition metals and can have various charges (oxidation states). Now you can start memorizing the various oxidation states of the transition metals or you can do the following: To determine the charge on the metal, look at what it is bonded to.Group 7 elements (Cl, F, I, etc.) tend to gain an electron and be -1. Group 6 elements (O, S, etc.) tend to gain two and become -2.ow you can start memorizing the various oxidation states of the transition metals or you can do the following: To determine the charge on the metal, look at what it is bonded to.