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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 atomic and ionic radii $(M^{3+}$ ions$)$ of Lanthanide elements decrease with increase in atomic number. This effect is called as:
  • ✓
    Lanthanoid contraction.
  • B
    Lanthanoid expansion.
  • C
    Actinoid contraction.
  • D
    None of these.
✓

Answer

Correct option: A.
Lanthanoid contraction.
The atomic and ionic radii $(M^{3+}$ ions$)$ of Lanthanide elements decrease with increase in atomic number.
This effect is called Lanthanoid contraction. This is due to poor shielding of $f$ electrons.

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