Question

An element X is a metal with valency 3 and element Y is a non-metal with valency 3. [5]

i. Write the equations to show how X and Y forms ions.

ii. If Y is a diatomic gas, write the equation for the direct combination of X and Y to

form a compound.

iii. Draw the electron dot diagram to show the formation of magnesium chloride

(Mg=12, Cl= 17)​

Answer 1

Answer:

answers are in the PDF

take X as Aluminium and Y as Nitrogen to understand they have same properties as you said.

Explanation:

7be57cb6f0b81612d0296c0f04b7b249.pdf

Answer 2

Answer:

It is given that element X is a metal with valency 2 and element Y is a non-metal with valency 3.

i) Since X is a metal, it will lose the 2 electrons to form a $X^{2+}$ cation. The equation is as follows:

$X$ → $X^{2+} + 2e^-$

Since Y is a non-metal, it will accept 3 electrons to form an $Y^{3-}$ anion. The equation is as follows:

$Y + 3e^-$ → $Y^{3-}$

ii) If Y is a diatomic gas, the combination of X and Y will give a compound $X_3Y_2$. The reaction is as follows:

$3X + Y_2$ → $X_3Y_2$

iii) Magnesium is a metal having 2 valence electrons. It will lose these 2 electrons to form a cation $Mg^{2+}$. Chlorine is a non-metal having 7 valence electrons. It will take 1 electron to form an anion $Cl^-$.

So, one magnesium atom loses two electrons which are taken by two chlorine atoms and thus form magnesium chloride $MgCl_2$.

The electron dot diagram is as follows:

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