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Lanthanoid contraction is caused due to:...

Lanthanoid contraction is caused due to:

A

the appreciable shielding on outer electrons by `4f` electron from the nuclear charge

B

the appreciable shielding on outer electrons by `5d` electrons from the nuclear charge

C

the same effective nuclear charge from `Ce to Lu`.

D

the imperfect shielding on outer electrons by `4f` electrons from the nuclear charge

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The correct Answer is:
D
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