What does lanthanoid contraction result in?

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(C) Lanthanoid contraction refers to the steady decrease in the atomic and ionic radii of the lanthanoid elements as the atomic number increases from

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Decrease in ionic radius

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(C) Lanthanoid contraction refers to the steady decrease in the atomic and ionic radii of the lanthanoid elements as the atomic number increases from $La$ $(Z=57)$ to $Lu$ $(Z=71)$.This is due to the poor shielding effect of the $4f$ electrons,which causes the effective nuclear charge to increase,pulling the valence electrons closer to the nucleus.

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