For the energy levels in an atom,which one of | vedclass

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(D) $1$. 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 quant

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Both $(b)$ and $(c)$.

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(D) $1$. 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 $4s$,$(n+l) = 4+0 = 4$. For $3d$,$(n+l) = 3+2 = 5$. Thus,$4s$ has lower energy than $3d$. Statement $(a)$ is incorrect.$2$. The maximum number of electrons in a main energy level $n$ is given by $2n^2$. For $n=5$,maximum electrons $= 2(5)^2 = 2(25) = 50$. Statement $(b)$ is correct.$3$. For the second principal energy level $(n=2)$,the orbitals present are $2s$ $(l=0)$ and $2p$ $(l=1)$. The number of orbitals is $n^2 = 2^2 = 4$ (one $2s$ and three $2p$ orbitals). The maximum number of electrons is $2n^2 = 2(2)^2 = 8$. Statement $(c)$ is correct.$4$. Since both $(b)$ and $(c)$ are correct,the correct option is $(d)$.

For the energy levels in an atom,which one of the following statements is correct?

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