Lanthanide contraction occurs because

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Question

(D) Lanthanide contraction occurs because $f-$orbital electrons are poor shielders of nuclear charge. Due to the poor shielding effect of $f-$electron

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$f-$ orbital electrons are poor shielders of nuclear charge

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(D) Lanthanide contraction occurs because $f-$orbital electrons are poor shielders of nuclear charge. Due to the poor shielding effect of $f-$electrons,the effective nuclear charge increases as we move across the lanthanide series,which results in a gradual decrease in the atomic and ionic radii.

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