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Lanthanide contraction occurs because...

Lanthanide 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

Verified by Experts

The correct Answer is:
D
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