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OpenStudy (anonymous):
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? A) 3d B) 4p C) 4d D) 4f
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OpenStudy (anonymous):
3d
OpenStudy (anonymous):
The 4s subshell has already been filled so the next electron will enter in 3d orbital
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