1.

Which of the following has maximum number of paired electrons.A. `Cu^(+)`B. `Fe^(3+)`C. `Zr^(+)`D. `Se^(+)`

Answer» (1) `Cu_(29)^(+)-[Ar]_(18)3d^(10)` (2) `Fe_(26)^(+2)=[Ar]_(18)3d^(6)`
(3) `Zr_(40)^(+)=[Kr]_(36)5s^(1)3d^(2)` (4) `Se_(21)^(+)=[Ar]_(18)4s^(1)3d^(1)`


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