A) lesser energy difference between \[5f\] and\[6d\]orbitals than between \[4f\] and \[5d\]orbitals
B) larger atomic size of actinides than the lanthanides
C) more energy difference between \[5f\] and 6d orbitals than between \[4f\] and 5d orbitals
D) greater reactive nature of the actinides than the lanthanides
Correct Answer: A
Solution :
The main reason for larger number of oxidation states exhibited by actinides than corresponding lanthanides is lesser energy difference between \[5f\] and \[6d\] orbitals than between \[4f\] and \[5d\]-orbitals.
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