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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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Configurations with completely filled and half filled orbitals have extra stability. In `3d^(10) 4s^(1)`, d-orbitals are completely filled and s-orbital is half filled. Hence, it is a more stable configuration
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