Oxidation Numbers for Fe Iron

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Iron (Fe) by itself has an oxidation state of zero since free elements have an oxidation state of zero (e.g. Na, Fe, H2, O2, S8). When bonded to other elements Fe has two main oxidation states: Fe +2 and Fe +3. • One +3 oxidation state for Iron can be found in the compound Iron oxide, FeCl3. In FeCl2 it has a +2 oxidation state. Oxidation numbers for each of these compounds is calculated in this video. • --------- • RESOURCES • How to Find Oxidation Numbers (rules and examples): • How to Find Oxidation Numbers (Rules... • Oxidation Numbers Practice: • Finding Oxidation Numbers Practice Pr... • -------- • General RULES • Free elements have an oxidation state of zero (e.g. Na, Fe, H2, O2, S8). • In an ion the all Oxidation numbers must add up to the charge on the ion. • In a neutral compound all Oxidation Numbers must add up to zero. • Group 1 = +1 • Group 2 = +2 • Hydrogen with Non-Metals = +1 • Hydrogen with Metals (or Boron) = -1 • Fluorine = -1 • Oxygen = -2 (except in H2O2 or with Fluorine) • Group 17(7A) = -1 except with Oxygen and other halogens lower in the group • ------- • More chemistry help at www.Breslyn.org.

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