What is the ferrous state of iron?

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What is the ferrous state of iron?

Ferrous state means iron in the +2 oxidation state. The neutral metal is Fe0; when it loses two electrons, it becomes Fe2+ (ferrous). Lose one more electron and you get Fe3+ (ferric), which is not ferrous. So the ferrous form is Fe2+. The other options correspond to Fe0 (elemental iron), Fe3+ (ferric), and Fe+ (a +1 oxidation state, not ferrous). In biology, Fe2+ is the form that typically binds oxygen in heme proteins, underscoring its relevance as the ferrous state.

Ferrous state means iron in the +2 oxidation state. The neutral metal is Fe0; when it loses two electrons, it becomes Fe2+ (ferrous). Lose one more electron and you get Fe3+ (ferric), which is not ferrous. So the ferrous form is Fe2+. The other options correspond to Fe0 (elemental iron), Fe3+ (ferric), and Fe+ (a +1 oxidation state, not ferrous). In biology, Fe2+ is the form that typically binds oxygen in heme proteins, underscoring its relevance as the ferrous state.

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