Assertion: Shielding effect increases as we move down the group.
Reason: The addition of extra shells causes the electrons to be loosely held.

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Both assertion and reason are correct, and the reason is the correct explanation for assertion.

Both assertion and reason are correct, but the reason is not the correct explanation for assertion.

The assertion is correct, but the reason is incorrect

Both assertion and reason are incorrect

answer is A.

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Detailed Solution

As we move down the group, more shells are added to the elements as a result the outermost electrons get very less nuclear charge because the inner shell electrons utilise most of the nuclear charge which shields the outer electrons from the nucleus.

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