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

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(D) $1$. The principal energy levels are denoted by $n = 1, 2, 3, 4, 5, 6, 7$ for the known elements in the ground state,so statement $A$ is generally

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The $4s$ sub-energy level is at a lower energy than the $3d$ sub-energy level.

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(D) $1$. The principal energy levels are denoted by $n = 1, 2, 3, 4, 5, 6, 7$ for the known elements in the ground state,so statement $A$ is generally accepted in the context of the periodic table.$2$. The second principal energy level $(n = 2)$ has only $2$ sub-energy levels ($2s$ and $2p$),so statement $B$ is incorrect.$3$. The $M$ energy level corresponds to $n = 3$. The maximum number of electrons in a shell is given by $2n^2$. For $n = 3$,$2(3)^2 = 18$ electrons. Thus,statement $C$ is incorrect.$4$. According to the $(n+l)$ rule,for $4s$,$(n+l) = 4+0 = 4$. For $3d$,$(n+l) = 3+2 = 5$. Since $4 < 5$,the $4s$ sub-energy level has lower energy than the $3d$ sub-energy level. Thus,statement $D$ is correct.

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

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