MHT CET Chemistry question

The actinoids exhibit more number of oxidation states, greater than the lanthanoids. This is because [AIEEE 2007]

(A)The 5f orbitals are more buried than the 4f orbitals
(B)There is similarity between 4f and 5f orbitals in their angular part of the wave function
(C)The actinoids are more reactive than the lanthanoids
(D)The 5f orbitals extend further from the nucleus than the 4f orbitalsCorrect

Answer: (D)

Solution

5f orbitals extend further from the nucleus and are more easily involved in bonding (5f, 6d and 7s energies are close),

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Question ID VK-074770