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(A) The maximum number of electrons (and thus elements) that can be accommodated in a shell with principal quantum number $n$ is given by the formula

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$60$

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(A) The maximum number of electrons (and thus elements) that can be accommodated in a shell with principal quantum number $n$ is given by the formula $2n^2$.For $n = 1$,the number of elements is $2(1)^2 = 2$.For $n = 2$,the number of elements is $2(2)^2 = 8$.For $n = 3$,the number of elements is $2(3)^2 = 18$.For $n = 4$,the number of elements is $2(4)^2 = 32$.Since the principal quantum number $n$ cannot exceed $4$,the total number of possible elements is the sum of elements in shells $n=1, 2, 3,$ and $4$.Total elements $= 2 + 8 + 18 + 32 = 60$.

List-$I$	List-$II$
$1$. Nitrogen molecules	$(A)$ Continuous spectrum
$2$. Incandescent solids	$(B)$ Absorption spectrum
$3$. Fraunhofer lines	$(C)$ Band spectrum
$4$. Electric arc between iron rods	$(D)$ Emission spectrum

If in nature there may not be an element for which the principal quantum number $n > 4,$ then the total possible number of elements will be

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