Choose the correct option regarding the following. Assertion Actinides exhibit a larger number of oxidation…
Choose the correct option regarding the following.
Assertion Actinides exhibit a larger number of oxidation states than lanthanides.
Reason There is a large energy gap between $5 f, 6 d$ and $7 s$ sub-shells.
Assertion and Reason are correct, and Reason is the correct explanation for the Assertion.
Assertion and Reason are correct, and Reason is not the correct explanation for the Assertion.
Assertion is correct, Reason is wrong.
Assertion is incorrect, Reason is correct.
Solution
Actinides exhibit larger oxidation states than lanthanides because of the very small energy gap between $5 f, 6 d$ and $7 s$ subshells. Thus, the outermost electrons get easily excited to the higher energy levels, giving variable oxidation states. Hence, Assertion is correct, Reason is incorrect. Thus, the correct option is (3).