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(C) According to the Aufbau principle,electrons fill orbitals in order of increasing energy. The energy order is determined by the $(n + l)$ rule. For

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$4p$

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(C) According to the Aufbau principle,electrons fill orbitals in order of increasing energy. The energy order is determined by the $(n + l)$ rule. For $3d$,$(n + l) = 3 + 2 = 5$. After $3d$ is filled,the next orbitals to be filled are $4p$ $(n + l = 4 + 1 = 5)$ and $5s$ $(n + l = 5 + 0 = 5)$. However,comparing $3d$ $(n=3, l=2)$ and $4p$ $(n=4, l=1)$,the $4p$ orbital has a higher energy than $3d$. Thus,after the $3d$ subshell is completely filled,the next electron enters the $4p$ orbital.

When the $3d$ orbital is completely filled,the next entering electron will be in the ....... orbital.

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