Question

Assertion :The chemistry of the early actinoids is more complicated than the corresponding lanthanoids. Reason: Outer electronic configuration of actinoids is $(n-2)f^{1-14}(n-1)d^{0-1}n{s}^2$.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

The chemistry of the early actinoids is more complicated than the corresponding lanthanoids, due to a large number of oxidation states possible for these elements. The oxidation state varies from +3 to +6 due to the small energy gap between valence orbitals i.e. $7s,6d,5f$.

Actinoids have the outer electronic configuration of actinoids is $5f^{1-14}6d^{0–1}7s^2$.

Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion