The element X has the following electron conf | vedclass

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(D) The electronic configuration of element $X$ is $2, 8, 8, 2$.$1$. The number of shells occupied by electrons determines the period number. Here,the

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Fourth period and second group

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(D) The electronic configuration of element $X$ is $2, 8, 8, 2$.$1$. The number of shells occupied by electrons determines the period number. Here,there are $4$ shells $(K, L, M, N)$,so the element belongs to the $4^{th}$ period.$2$. The number of valence electrons (electrons in the outermost shell) determines the group number. Here,there are $2$ valence electrons,so the element belongs to the $2^{nd}$ group.Therefore,element $X$ belongs to the $4^{th}$ period and $2^{nd}$ group.

The element $X$ has the following electron configuration $2, 8, 8, 2$. It means that it belongs to:

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