what is the electronic configuration of Cu^(2+) (Z=29) of least positi

1.	what is the electronic configuration of Cu^(2+) (Z=29) of least position
Answer» `[AR]4s^1 3d^8` `[Ar]4s^23d^10 4p^1` `[Ar] 4s^1 3d^10` `[Ar] 3d^9` Solution :`._29Cu=[Ar]3d^10 4s^1 , Cu^(2+)=[Ar] 3d^9 . 4s^0` GROUND state of `Cu^29=1s^2 2s^2 2p^6 3s^2 3p^6 3d^10 4s^1` `Cu^(2+)=1s^2 , 2s^2 2p^6 , 3s^2 3p^6 3d^9`

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