Which of the following pair represents elements of same group?

Q, R

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P, Q

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P, S

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Q, S

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Solution

The correct option is A Q, R
Alkali metals acquire noble gas configuration after removal of one electron. Thus, they have high second ionisation energy. $Q$ and R have a large difference in their second and first ionisation energy. Thus, they both represent alkali metals. Therefore, they are elements of the same group.

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