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Write the electronic configuration of iron (Fe) and explain its variable oxidation states.

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Detailed Solution

Atomic number of Fe = 26.

Electronic configuration: [Ar] 3d⁶ 4s².

Iron shows +2 and +3 oxidation states due to loss of 2 electrons (from 4s orbital) or 3 electrons (2 from 4s and 1 from 3d).

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