Q.

The actinoids exhibit more number oxidation states in general than the lanthanoids. This is because of

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a

there is a similarity between 4f and 5f orbitals in their angular part of the wave function

b

the 5f orbitals are more buried than the 4f orbitals

c

 the 5f orbitals extend farther a way from the nucleus than the 4f orbitals

answer is D.

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Detailed Solution

The 5f orbitals, being further away from the nucleus as compared to 4f orbitals, will have energies near to 4d orbitals and thus both 4d and 5f orbitals are utilized in the formation of larger number of oxidation states of actinides.

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