Question

calculate and write the valency of MgCl2

Answer 1

Valency of MG is +2
And Valency of Cl is - 1
Total charge on MgCl2 will be zero.
Hope that will help.

Answer 2

Valency of Calculation for $MgCl_2$.

Explanation:

• To calculate the valency of the compound, the electronic configuration of the combining elements must be identified.
• In the case of $MgCl_2$, the combining elements are Magnesium and Chlorine.
• The electronic distribution of Magnesium is 2,8,2. It means that magnesium has 2 electrons in its outermost shell.
• If the valence electron is less than 4, it is considered as valency.
• As magnesium has 2 valence electron, its valency is 2.
• On the other hand for chlorine, it is 2,8,7. It means that chlorine has 7 electrons in its outer most shell.
• If the valence electron is more than 4, then the valency must be calculated through the following formula:

Valency = Valence electron -8

• Accordingly, the valency of chlorine is 7-8 which is -1.
• Thus the valency of Mg is 2, whereas for chlorine it is -1.

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