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Hello! I'm confused on how to correctly write electron configurations. For example, in the homework problem 1E.23, it asks for the electron configuration of Ga, Ge, As, Se and Br. For Ga, I wrote the electron configuration as [Ar] 4s23d104p1. However, in the solution manual, they wrote it as [Ar]3d104s24p1. Is there a specific order or can I write the electron configuration how I did.
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