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

Bihar BoardEnglish MediumSTD 12 ScienceChemistryThe d & f Block Elements1 Mark
MCQ
The Lanthanoids contraction relates to:
  • A
    Atomic radii.
  • B
    Atomic as well as M3+ radii.
  • C
    Valence electrons.
  • D
    Oxidation states.
✓

Answer

  1. Atomic as well as M3+ radii.

Explanation:

The Lanthanoids contraction relates to atomic as well as M3+ radii.

The atomic and ionic radii (M3+ ions) of Lanthanide elements decrease with increase in atomic number. This effect is called Lanthanoid contraction. This is due to poor shielding of 4f electrons.

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