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An Intiative by Sri Chaitanya
a
4f orbitals more diffused than the 5f orbitals
b
Lesser energy difference between 5f and 6d than between 4f and 5d orbitals
c
More energy difference between 5f and 6d than between 4f and 5d orbitals
d
More reactive nature of the actinoids than the lanthanoids
answer is B.
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