Fe atom has actually `26` electrons. `Fe^(2+)` and also `Fe^(3+)` ions are formed by remove of two and also three electrons respectively indigenous Fe atom and also hence save on computer `24` and `23` electron respectively. Their digital configuration are: `(##RES_PHY_CHM_V01_XI_C02_E01_024_A01##)` `Fe^(2+)` has `4` unpaired electron while `Fe^(3+)` has `5` unpaired electrons. Therefore, `Fe^(3+)` has an ext number of unpaired electrons.

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