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Yes, for the midterm I think we only have to know copper and chromium. However, this does show up in some hw problems so the exception where the s shell only has 1 electron is also true for the elements in the column just below Cr and Cu, which are molybdenum and silver. This is for the same reason, because it is most stable when the d subshell is half full (5) or totally full (10).
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