Question

a.)Element X is a metal with a valency 2.Element Y is a non- metal with a valency3.
1)write equation to show how X and Y form ions

Answer 1

Task:

a.) Element X is a metal with a valency 2. Element Y is a non-metal with a valency 3.

1) write equation to show how X and Y form ions

Answer:

The chemical equation for the synthesis reaction between X and Y is

$$3X + 2Y \rightarrow X_3Y_2$$

If the difference between their electronegativities is big enough, they form ionic compound. It's oxidation-reduction reaction.

Metal tends to gain electrons because of it's electron configuration. And that's why the metal is reduction agent and is oxidized in this reaction.

$$X - 2e^- = X^{2+}$$

The non-metal tends to accept electrons because of it's higher electronegativity. That's why it is oxidation agent and is reduced in this reaction.

$$Y + 3e^- = Y^{3-}$$

Let's write oxidation and reduction reactions together

$$\begin{array}{l} X - 2e^- = X^{2+} \quad | \times 3 \\ Y + 3e^- = Y^{3-} \quad | \times 2 \end{array}$$ $$\longrightarrow 3X + 2Y \rightarrow X_3Y_2$$