Question

Larger number of oxidation states are exhibited by the actinoids than those by the lanthanoids, the main reason being.

• A. Lesser energy difference between 5f and 6d than between 4f and 5d orbitals
• B. More energy difference between 5f and 6d than between 4f and 5d orbitals
• C. More reactive nature of the actinoids than the lanthanoids
• D. 4f orbitals more diffused than the 5f orbitals

Answer 1

Answer: (A)

Lesser energy difference between 5f and 6d than between 4f and 5d orbitals

Answer 2

There is very small energy difference between 5f and 6d orbitals in actinoids than those of between 4f and 5d orbitals. Hence, electrons present in 5f and 6d orbitals can take part in bonding.