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Out of the following which one has more ...

Out of the following which one has more number of unpaired electrons ?
`Zn,Fe^(2+),Ni^(3+),Cu^(+)`

Text Solution

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The electronic configurations of the given elements are
`._(30)Zn.....4s^(2)3d^(10),._(26)Fe^(2+)...3d^(6), ._(28)Ni^(3+)....3d^(7), ._(29)Cu^(+)...3d^(10)` . `Fe^(2+)` has four unpaired electrons which is maximum in the given set. Zinc and copper has no unpaired electrons while nickel has three unpaired electrons.
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