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

decrease in both atomic and ionic radii

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increase in atomic radii and decrease in ionic radii

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increase in both atomic and ionic radii

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decrease in atomic radii and increase in ionic radii

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Solution

The correct option is C decrease in both atomic and ionic radii
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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