Statement-1: Lanthanoid contraction is more important than actinoid contraction. Statement-2: Chemistry of elements surrounding the actinoids are much less known at the present time.

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Statement-1 is False, Statement-2 is True.

Statement-1 1S True, Statement-2 is True, Statement-2 is NOT a correct. explanation for Statement-1

Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1

Statement-1 is True, Statement-2 is False.

answer is A.

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Detailed Solution

In comparison to 4f orbitals, 5f orbitals have a worse shielding effect. As a result, actinides' valence shell electrons experience a bigger effective nuclear charge than lanthanides do. As a result, lanthanoid contraction is less effective than actinoid contraction.
The chemistry of the substances that surround actinoids is now considerably less understood.

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