Statement 1: Actinoid contraction is greater from element to element than lanthanoid contraction.
Statement 2: 5f orbitals have a poor shielding effect than 4f-orbitals

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Statement 1 is false and Statement 2 is true

Both statements are false

Both statements are true

Statement 1 is true and Statement 2 is false

answer is D.

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Detailed Solution

Lanthanoid contraction: The steady decrease in atomic and ionic size of lanthanoids as their atomic number increases. (Poor shielding effect of 4f-electrons).
Actinoid contraction: It refers to the gradual decrease in the ionic radii with increase in an atomic number of actinoids. (Poor shielding effect of 5f-electrons). The shielding effect in 5f-orbitals is poor than 4f-orbitals.

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