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Three elements P, Q, and R have successi...

Three elements P, Q, and R have successive atomic numbers with same period . If P > R > Q in terms atomic size. Predict the group of each element. Give reason.

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Since P, Q, and R have successive atomic numbers, they lie in the same period. We know that even though atomic size decreases along a period, inert-gas elements have a slightly bigger atomic size than that of their preceding element. Hence, R must be an inert gas. Hence, the group numbers of P. Q. and Rare 16, 17, and 18 respectively.
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