Calcium (atomic number 20) has electron configuration 1s2,2s2,2p6,3s2,3p6,4s2. The atomic number of scandium is 21. Which orbital does the 21st electron enter?

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Calcium (ultimate sum 20) has electron figure 1s2,2s2,2p6,3s2,3p6,4s2. The ultimate sum of scandium is 21. Which orbital does the 21st electron invade?
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