MCQ
The Lanthanoid contraction refers to:
  • Vlence electrons of the Lanthanide series.
  • B
    Ionic radius of the series.
  • C
    The density of the series.
  • D
    Nuclear mass of the series.

Answer

Correct option: A.
Vlence electrons of the Lanthanide series.
Lanthanide contraction is a term used to describe the greater than expected decrease in ionic radii of the elements in the lanhtanide series from atomic number $57$ i.e. lanthanum to $71$ lutetium, which results in smaller than otherwise expected ionic radii for the subsequent elements starting with $72$ i.e. hafnium.

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