Element $X$ and $Y$ have valence shell electron configuration as $X : n s^{2} n p^{5}$ and $Y : n s^{1}$ . Which compound is likely to be formed from $X$ and $Y$ ?

X_{3} Y_{5}

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Y_{3} X_{5}

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X Y

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Y X

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Solution

The correct option is D $Y X$
$X : n s^{2} n p^{5}$ electronegative element has total 7 valence electrons so, it will have a tendency to accept one electron and complete its octet. So, its valency $= - 1$ .
$Y$ : electropositive alkali metal have one valence electron, so it has a tendency to loose one electron and complete its octet. So its valency $= + 1$ .
$\begin{matrix} Y \to Y^{+} + e^{-} & Y^{+} X + e^{-} \to X^{-} & X^{-} \end{matrix}}$ have inert gas configuration
The compound is $Y^{+} X^{-}$ .

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Element X and Y have valence shell electron configuration as X:ns2np5 and Y:ns1. Which compound is likely to be formed from X and Y?

Element $X$ and $Y$ have valence shell electron configuration as $X : n s^{2} n p^{5}$ and $Y : n s^{1}$ . Which compound is likely to be formed from $X$ and $Y$ ?