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Groups in Modern Periodic Table

AlCl3 is know...

Question

AlCl3 is known as aluminium chloride but PCl3 is known as phosphorous trichloride.Why?

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Solution

Aluminium has a valency of 3 and forms a compound called aluminium chloride with chlorine . It is stable . But phosphorus has a valency of 3 and 5. Hence , it is called phosphorous trichloride and phosphorous pentachloride.

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