Element X is a metal with a valency 2. Element Y is a non-metal with a valency 3.
(a) Write equations to show how X and Y form ions.
(b) If Y is a diatomic gas, write the equation for the direct combination of X and Y to form a compound.

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Solution

(a) Element X will lose its valence electrons to form a cation as shown below:

X → X²⁺ + 2e^-

Element Y will gain three electrons to form an anion as shown below:

Y + 3e^- → Y³^-

(b) One atom of Y gain 3 electrons therefore two atoms of Y will gain 6 electrons which can be represented as:
$Y_{2} + 6 e^{-} \to Y_{2}^{3 -}$
To balance these 6 electrons 3 atoms of X will be taken.

So, the direct combination of elements X and Y can be represented by the following chemical equation:
3X + Y₂ $\to$ X₃Y₂

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Element X is a metal with a valency 2. Element Y is a non-metal with a valency 3. (a) Write equations to show how X and Y form ions. (b) If Y is a diatomic gas, write the equation for the direct combination of X and Y to form a compound.

Element X is a metal with a valency 2. Element Y is a non-metal with a valency 3.
(a) Write equations to show how X and Y form ions.
(b) If Y is a diatomic gas, write the equation for the direct combination of X and Y to form a compound.