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

1. actinoid contraction
2. 5f, 6d and 7s levels having comparable energies
3. 4f and 5d levels being close in energies
4. the radioactive nature of actinoids

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

Solution

The actinoids exhibit a greater range of oxidation states because their 5f, 6d, and 7s orbitals have comparable energies, allowing electrons to be easily removed or shared from these orbitals.

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