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Among cuprous and cupric, which has more...

Among cuprous and cupric, which has more stable configuration? Why? 

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Electronic configuration of `Cu^(+)` (cuprous) is `[Ar]3d^(10)` and of `Cu^(2+)` (cupric) is `[Ar]3d^(9)`
Cuprous has more stable configuration.
This is  because `d^(10)` is completely filled d-subshell. Due to spherical symmetry, it is more stable configuration:
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