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Octet Rule

An element M ...

Question

An element M is in the 13th group.what is the formula of its chloride?

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Solution

13 th group has 3 electrones in the valance shell and thus has a valency of 3.
It loses electrones to form cation with charge 3+.
Chloride has a charge of -1.Thus 3 chorides can be accomodated.
Thus formula is MCl3

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