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

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The reason for greater range of oxidation states in actinoids is attributed to
A. the radioactive number of actinoids
B. actinoid contraction
C. 5f,6d and 7s levels having comparable energies
D. 4f and 5d levels being close in energies
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The greater range of oxidation states shown by actinoids is due to 5f,6d and 7s levels having comparable energies and thus all their electrons can take part in bond formation.
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