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The same idea does apply to the 5s orbital, and it is filled before 4d. However, there is no 4f electron configuration for period five, as 4f1 begins after lanthanum. I don't think we need to know the specific patterns of period 5, like why it is 4d4 5s1 instead of 4d3 5s2, just be able to count the number of electrons in d across the periodic table.
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