Answer:
MgCl₂ → Mg²⁺ + Cl₂
Step-by-step explanation:
The given equation is incorrect because Mg shows +2 oxidation state.
Correct chemical equation:
MgCl₂ → Mg²⁺ + Cl₂
Magnesium is present in group two of periodic table.
It is alkaline earth metal.
It has two valance electrons.
Thus by losing two valance electrons it complete the octet. The common oxidation state of magnesium is +2.
The chlorine is present in group seventeen.
It has seven valance electrons.
It is the member of halogen family.
To complete the octet chlorine required one electron. By gaining the one electron it showed -1 oxidation state.
When chlorine combine with magnesium both formed MgCl₂.
The one atom of Mg have +2 oxidation state while chlorine have -1 that's why to make the overall compound neutral two chlorine atoms combine with one atom of magnesium.
When compound is break, two chlorine atoms combine with each other sharing the electrons and form covalent bond. While Mg atom formed Mg⁺² cation.