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(A, D) $1$. The principal energy levels are denoted by $n = 1, 2, 3, 4, 5, 6, 7$. Thus,there are seven principal energy levels. Statement $A$ is corre

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There are seven principal electron energy levels.

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(A, D) $1$. The principal energy levels are denoted by $n = 1, 2, 3, 4, 5, 6, 7$. Thus,there are seven principal energy levels. Statement $A$ is correct.$2$. For the second principal energy level $(n = 2)$,the sub-energy levels are $2s$ and $2p$ $(l = 0, 1)$. It can hold a maximum of $2n^2 = 2(2)^2 = 8$ electrons. Statement $B$ is incorrect because it has only $2$ sub-energy levels.$3$. The $M$ energy level corresponds to $n = 3$. The maximum number of electrons is $2n^2 = 2(3)^2 = 18$. 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. Statement $D$ is correct.

Type of microbes	Scientific name	Commercial product
Bacterium	$a$	Clot buster
$b$	Aspergillus niger	Citric acid
Fungus	Trichoderma polysporum	$c$
Bacterium	$d$	Butyric acid

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

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