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An Intiative by Sri Chaitanya
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.
answer is A.
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