When the 3d orbital is complete,the next elec | vedclass

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(A) According to the $(n+l)$ rule,the energy of an orbital is determined by the sum of its principal quantum number $(n)$ and azimuthal quantum number

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$4p$-orbital

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(A) According to the $(n+l)$ rule,the energy of an orbital is determined by the sum of its principal quantum number $(n)$ and azimuthal quantum number $(l)$.For $4p$,$n=4$ and $l=1$,so $(n+l) = 4+1 = 5$.For $4d$,$n=4$ and $l=2$,so $(n+l) = 4+2 = 6$.For $4f$,$n=4$ and $l=3$,so $(n+l) = 4+3 = 7$.Since the $4p$ orbital has the lowest $(n+l)$ value among the given options,the next electron will enter the $4p$-orbital.

When the $3d$ orbital is complete,the next electron will enter the

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