Assertion :The radius of group 18 is always greater than elements of corresponding group 17. Reason: Complete subshell have relatively greater radius

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Across the period in the periodic table, atomic size decreases up to halogens but increases in noble gases. This is because in case of inert or noble gases all the orbitals are completely filled and hence inter electronic repulsions are maximum.
In case of noble gases atomic radius is determined by van der waals radius and as we know that van der waals radius is larger than the ionic radius that is in case of halogens. Hence the atomic size of noble gases is larger than that of halogens.
Hence option A is correct answer.

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