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

Vedclass · Accepted Answer

$5p$

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(C) According to the $(n+l)$ rule,the energy of an orbital is determined by the sum of the principal quantum number $(n)$ and the azimuthal quantum number $(l)$.For $5p$ orbital: $n=5, l=1$,so $(n+l) = 5+1 = 6$.For $4f$ orbital: $n=4, l=3$,so $(n+l) = 4+3 = 7$.For $5d$ orbital: $n=5, l=2$,so $(n+l) = 5+2 = 7$.For $6s$ orbital: $n=6, l=0$,so $(n+l) = 6+0 = 6$.After the $4d$ orbital is filled,the electrons fill the $5p$ orbital before moving to the $6s$ orbital. Therefore,the next orbital to be filled after $4d$ is $5p$.

When the $4d$ orbital is complete,the newly entering electron goes into which orbital?

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