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

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Increase in Both atomic and ionic radii

Decrease in atomic radii and increase in ionic radii

Decrease in Both atomic and ionic radii

Increase in atomic radii and decrease in 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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