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Q.

What is the formula of magnesium chloride?

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Detailed Solution

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MgCl2  is correctly written for magnesium chloride.
The electronic configuration of magnesium is 2,8,2 and belongs to group 2 element, and this group has valency 2. 

The electronic configuration of the Chlorine is 2,8,7 the valency of chlorine is 1. Therefore, the chemical formula for the magnesium chloride is MgCl2.
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