A) lesser energy difference between 5\[f\]and 6d orbitals than between 4\[f\]and 5d-orbitals
B) larger atomic size of actinides than the lanthanides
C) more energy difference between 5\[f\]and 6d orbitals than between 4\[f\]and 5d-orbitals
D) greater reactive nature of the actinides than the lanthanides.
Correct Answer: A
Solution :
[a] As both 5f and 4f orbitals have similar shapes and they resemble in their angular part of the wave functions. But 4f orbitals is much more penetrated then 5f orbital towards nucleus.
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