Home Chemistry D and F - Block Elements Skill Builder Lanthanoid contraction occurs because
Chemistry D and F - Block Elements Skill Builder Single Correct MCQ
Published on: August 14, 2026

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

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The correct answer is:
D

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

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