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Question

(D) Group $1$ elements $(M)$ have an outermost shell electronic configuration of $ns^1$,making them monovalent with a valency of $+1$.Group $16$ eleme

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$M_2 X$

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(D) Group $1$ elements $(M)$ have an outermost shell electronic configuration of $ns^1$,making them monovalent with a valency of $+1$.Group $16$ elements $(X)$ have an outermost shell electronic configuration of $ns^2 np^4$,requiring $2$ electrons to complete their octet,making them divalent with a valency of $-2$.To form a neutral ionic compound,the total positive charge must balance the total negative charge.Thus,two atoms of $M$ (each $+1$) are required to balance one atom of $X$ $(-2)$.The resulting formula is $M_2 X$.

The general formula of the compound formed when a metal $(M)$ of group $1$ reacts with a non-metal $(X)$ of group $16$ is:

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