Explain why the electron configuration for copper is 1s 2 2s 2 2p 6 3s 2 3p

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Explain why the electron configuration for copper is 1s2s2p6 3s2 3p6 4s1 3d10 rather than the predicted 1s2 2s2 2p6 3s2 3p6 4s2 3d9.

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