Q.
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a
the actinides are more reactive than the lanthanides
b
the 5f-orbitals are more buried than the 4f-orbitals
c
there is a similarity between 4f and 5f-orbitals in their angular part of the wave function.
d
the 5f-orbitals extend farther from the nucleus than the 4f-orbitals.
answer is D.
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