Which ion has the stable electronic configuration? Ni^(2+) or Fe^(3+).

1.	Which ion has the stable electronic configuration? Ni^(2+) or Fe^(3+).
Answer» SOLUTION :`Ni(Z=28) . 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^8` `Ni^(2+)` electronic configuration `=1s^2 2s^2 2p^6 3s^2 3p^6 3d^8` `Fe (Z=26) . 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^6` `Fe^(3+) 1s^2 2s^2 2p^6 3s^2 3p^6 3d^5` If d orbital is half FILLED, according to Aufbau principle , it is more stable . So `Fe^(3+)` is more stable than `Ni^(2+)`.

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