JEE Advanced Chemistry question

The main reason for larger number of oxidation state exhibited by the actinides than that corresponding lanthanides, is

(A)Lesser energy difference between 5f and 6d orbitals than between 4f and 5d-orbitalsCorrect
(B)Larger atomic size of actinides than the lanthanides
(C)More energy difference between 5f and 6d orbitals than between 4f and 5d-orbitals
(D)Greater reactive nature of the actinides than the lanthanides

Answer: (A)

Solution

In actinides, the and subshells lie much closer together in energy than the and subshells do in lanthanides. This smaller energy gap means actinide electrons from both and can participate comparably easily in

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Question ID VK-159663