Question

b) Elements $\mathrm{X}$ is metal with a valency 2, $\mathrm{Y}$ is a non-metal with a valency 3.

1. Write an equation to show how $\mathrm{Y}$ forms an ions.
2. If $\mathrm{Y}$ is a diatomic gas, write an equation for the direct combination of $\mathrm{X}$ and $\mathrm{Y}$ to form a compound.

Answer 1

Elements $\mathrm{X}$ is a metal with valency 2 and elements $\mathrm{Y}$ is a non-metal with a valency 3.

1. $\mathrm{Y}$ is a non-metal that gain three electrons and forms ${\mathrm{Y}}^{3-}$ anion.

The chemical equation is:

$\mathrm{Y}+3{\mathrm{e}}^{-}\to {\mathrm{Y}}^{3-}\left(\mathrm{ion}\right)$

ii If $\mathrm{Y}$ is a diatomic gas then it will react with $\mathrm{X}$ to form a compound ${\mathrm{X}}_3{\mathrm{Y}}_2$.

The chemical equation is:

$3\mathrm{X}+{\mathrm{Y}}_2\to {\mathrm{X}}_3{\mathrm{Y}}_2$