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Question
An element X is in group 2 of the periodic table What will be the formula of its chloride?
Solution
An element X in group 2 has a valency of 2. We know that chlorine has 7 valence electrons. Therefore, the valency of chlorine Cl is 1, that is, (8 - 7).
Now, when one atom of X combines with two atoms of Cl, an ionic compound of the formula XCl2 is formed.
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