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Question

The reason for greater range of oxidation states in actinoids is attributed to:
  1. The radioactive nature of actinoids
  2. Actinoid contraction
  3. 5f, 6d and 7s levels having comparable energies
  4. 4f and 5d levels being close in energies


Solution

The correct option is C 5f, 6d and 7s levels having comparable energies
Minimum or comparable energy gap between 5f, 6d  and 7s subshell makes electron excitation easier. Hence, there is a greater range of oxidation states in actinoids.

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