Assertion- Atomic size increases on going down the group in the modern periodic table.

Reason- New shells are being added as we go down the group in the modern periodic table.

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Both Assertion and Reason are true and Reason is the correct explanation of Assertion.

Assertion is false, but Reason is true.

Assertion is true, but Reason is false.

Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.

answer is A.

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Detailed Solution

Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
Assertion: On moving down a group of the modern periodic table, the atomic radii of elements increase.
Reason: Down the group, electrons are filled in additional new shells with each element. So, the number of shells increases, and the effective nuclear charge on outer shell electrons becomes less effective. Hence, the size of elements increases down the group.

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