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MHT CET202615 April 2026Morning ShiftChemistryd and f Block ElementsActual

Identify the factor responsible for the greater range of oxidation states in actinoids.

Options

  1. Aactinoid contraction
  2. Bradioactive nature of actinoids
  3. C5f, 6d and 7s levels having comparable energies
  4. D4f and 5d levels being close in energies

Correct answer

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

Step-by-step solution

Actinoids exhibit a greater range of oxidation states compared to lanthanoids. This is because the energy difference between the 5f , 6d , and 7s orbitals is very small. As a result, electrons from all these energy levels can participate in bond formation, leading to variable and higher oxidation states. Answer: 5f, 6d and 7s levels having comparable energies

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