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Lanthanoid contraction occurs because...

Lanthanoid contraction occurs because

A

the 4f electrons, which are gradually added, create a strong shielding effect

B

the 4f orbitals are greater in size than the 3d and 3f orbitals

C

the 5f orbitals strongly penetrate into the 4f orbitals

D

the poor shielding effect of 4f electrons is coupled with increased attraction between the nucleus and the added electrons.

Text Solution

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The correct Answer is:
D
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