NEET 2017 Chemistry 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 energiesCorrect
(4)4f and 5d levels being close in energies

Answer: (3)

Solution

In the actinoids the 5f, 6d and 7s orbitals are of comparable energy (the 5f electrons are less tightly held than the 4f electrons of lanthanoids), so electrons from all three sets can take part in bonding. This gives actinoids a much wider range of

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Question ID VK-092082