NEET 2006 Chemistry question

More number of oxidation states are exhibited by the actinoids than by the lanthonoids. The main reason for this is:-

(1)More energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals
(2)Lesser energy difference between 5f and 6d orbitals than between 4f and 5d orbitalsCorrect
(3)Greater metallic character of the lanthanoids than that of the corresponding actinoids
(4)More active nature of the actinoids

Answer: (2)

Solution

In the actinoids the 5f, 6d and 7s orbitals are very close in energy (the 5f orbitals are less deeply buried and are more effectively involved in bonding), so electrons from 5f as well as 6d/7s can take part in bonding, giving a wider range of oxidation states (+3 to +7). In the

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Question ID VK-089593