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Why does the actual electron configuration of copper differ from the expected one?

April 26, 2017actual configuration Copper differ electron

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Why does the actual electron configuration of copper differ from the expected one?

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Chromium and copper have electron configurations [Ar] 3d5 4s1 and [Ar] 3d10 4s1 respectively, i.e. one electron has passed from the 4s-orbital to a 3d-orbital to generate a half-filled or filled subshell. ChaCha!