Question

Assertion (A) Actinoid contraction is, however, greater from element to element in the series.
Reason (R) There is poor shielding by $5 f$-electrons.

• A. Both $A$ and $R$ are correct; $R$ is the correct explanation of $A$.
• B. Both $A$ and $R$ are correct; $R$ is not the correct explanation of $A$.
• C. $A$ is correct; $R$ is incorrect.
• D. $R$ is correct; $A$ is incorrect.

Answer 1

Answer: (A)

Correct answer is (a) Both $A$ and $R$ are correct; $R$ is the correct explanation of $A$.