Q.

The reason for greater range of oxidation states in actinoids is attributed to 

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a

5f, 6d and 7s levels having comparable energies

b

4f and 5d levels being close in energies

c

actinoid  contraction

answer is D.

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Detailed Solution

Actinoids have a greater range of oxidation states due to comparable energies of 5f, 6d and 7s orbitals. Hence, all their electrons can take part in bond formation.

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The reason for greater range of oxidation states in actinoids is attributed to