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Number of unpaired electrons in Fe^(3+) ...

Number of unpaired electrons in `Fe^(3+)` (Z = 26) is

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The electronic configuration of Fe is
Fe: `1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(6) 3d^(6) 4s^(2)`
Fe atom loses 3 electrons to form `Fe^(3+)`.Therefore, electronic configuration of `Fe^(3+)` is
`Fe^(3+): 1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(6) 3d^(5)`
The 3d sub-shell of `Fe^(3+)` ion is half-filled. Each orbital of 3d sub-shell is singly occupied with their spin parallel.Therefore, `Fe^(3+)` has 5 unpaired electrons
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