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A scientist was studying reactions of me...

A scientist was studying reactions of metals and non-metals. He knew group 1 and 2 elements are metals while group 17 elements are non- metals. So, he chooses different elements from group 1, group 2 and group 17.
What is the valency of magnesium?

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As Magnesium belongs to group 2, its valency is 2.
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