The reason for lanthanoid contraction is

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(A) Lanthanoid contraction is the regular decrease in atomic and ionic radii of lanthanides. This is due to the imperfect shielding (or poor screening

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negligible screening effect of $f$-orbitals

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(A) Lanthanoid contraction is the regular decrease in atomic and ionic radii of lanthanides. This is due to the imperfect shielding (or poor screening effect) of $f$-orbitals. Due to their diffused shape,$f$-orbitals are unable to effectively counterbalance the effect of the increased nuclear charge. Hence,the net result is a contraction in the size of lanthanoids.

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