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The electronic configuration of valence ...

The electronic configuration of valence shell of Cu is `3d^(10)4s^(1)` and not `3d^(9)4s^(2)`. How is this configuration explained?

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This is because completely filled and half filled orbitals have extra stability. In `3d^(10) 4s^(1),` d - orbitals are completely filled and hece this configuration is more stable.
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