AIPMT PRELIMS 2005 Chemistry Actinides MCQ Question
The main reason for larger number of oxidation states exhibited by the actinides than the corresponding lanthanides, is:
lesser energy difference between 5f and 6d orbitals than between 4f and 5d orbitals
larger atomic size of actinides than the lanthanides
more energy difference between 5f and 6d orbitals than between 4f and 5d orbitals
greater reactive nature of the actinides than the lanthanides
Correct Answer
Detailed Explanation
The 5f orbitals in actinides are more shielded and have lesser energy difference with 6d orbitals, allowing more oxidation states.
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