Two atoms $X$ and $Y$ have $2$ and $6$ electrons in their outermost shells. They form a compound of the type?

X Y

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X_{2} Y

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X Y_{2}

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X_{2} Y_{2}

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Solution

The correct option is A $X Y$
$\Rightarrow$ From the question the atom having $2$ electrons in outermost shell belong to $2 A$ group in periodic table.
$\Rightarrow$ In the same way $6$ electrons atom belongs to $6 A$ group.
$\Rightarrow$ They form a compound of $X Y$ type for example $C a O$ , $M g O$ . etc.

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