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You are a genius for learning this so quickly! Sulphur has \(6\) electrons in its outermost orbit. Instead of giving away \(6\) electrons, it is easier for it to accept \(2\) electrons. So, its valency is \(2\).

Magnesium has \(2\) electrons in its outermost orbit. So, just by giving away \(2\) electrons, it will have \(8\) electrons in its outermost orbit. Thus, its valency is \(2\).