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The d & f Block Elements — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryThe d & f Block Elements1 Mark
MCQ
The Lanthanide contraction relates to:
  • A
    Oxidation states.
  • B
    Magnetic state.
  • ✓
    Atomic radius.
  • D
    Valence electrons.
✓

Answer

Correct option: C.
Atomic radius.
Due to the poor shielding effect of $4f$ electrons the outer electrons experience more attractive force from nucleus.
Due to this attraction, the size of elements contracts. This contraction is known as lanthanide contraction. In this way, lanthanide contraction is related to atomic radii.

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