In the electron configurations for Cr and Cu+, why is the 4s orbital not filled before going to the 3d? | Cheap Nursing Papers
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In the electron configurations for Cr and Cu+, why is the 4s orbital not filled before going to the 3d?

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In the electron configurations for Cr and Cu+, why is the 4s orbital not filled before going to the 3d? I am asked to write the electron configurations for Mg, Br, Se, Cr, and Cu+. The first three follow the rules and the last two do not. Why?

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