Question

Valence electrons in the elements $X$ and $Y$ are 3 and 6. What is the formula of the compound formed from $X$ and $Y$?

• A. $X_2{Y}_3$
• B. $X_2{Y}_4$
• C. $X_3{Y}_3$
• D. None of these

Answer 1

The correct option is A $X_2{Y}_3$

Same number of electrons has to be shared/donated.

Therefore:
$3\times x=(8-6)\times y\frac{x}{y}=\frac{2}{3}$

Hence the compound is $X_2{Y}_3$.