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Q.

The lanthanoid contraction relates to
 

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a

 Atomic radii

 

b

Atomic as well ad M3+ radii
 

c

Valence electrons
 

d

Oxidation states

answer is B.

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Detailed Solution

  • 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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