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Q.

The effect of lanthanoid contraction in the lanthanide series of elements by and large means.

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a

Decrease in atomic radii and increase in ionic radii
 

b

Increase in atomic radii and decrease in ionic radii

c

Increase in Both atomic and ionic radii
 

d

Decrease in Both atomic and ionic radii
 

answer is C.

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Detailed Solution

Due to lanthanoid contraction, both atomic radii and ionic radii decrease gradually in the lanthanoid series. The Lanthanide contraction is caused by a poor shielding effect of the 4f electrons.

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