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It isn't

Fe is simply iron

There are three common oxides of iron.

Iron II oxide, FeO (Fe2+ ion and O2- ion)

Iron III oxide Fe2O3 (2 Fe3+ ions, 3 O2- ions)

Iron II, III oxide Fe3O4 (2Fe 3+ ions, 1 Fe2+ ion, 4O2- ions)

The formula are such that the overall charge of each oxide balances out to zero.

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13y ago
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Q: Why is Fe the correct chemical formula for iron oxide?
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