What is the valency of Magnesium in $M g_{3} N_{2}$ ?

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Solution

The valency of an element is a measure of its combining power with other atoms when it forms chemical compounds or molecules. [1 mark]

In $M g_{3} N_{2}$ , Magnesium nitride is formed when three molecules of magnesium combine with two molecules of nitrogen. [1 mark]

Hence, the valency of magnesium in $M g_{3} N_{2}$ is 2. [1 mark]

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