The reason for lanthanoid contraction is:

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(A) The lanthanoid contraction is primarily due to the poor shielding effect of $4f$ electrons. Because the $4f$ orbitals have a diffuse shape,they ar

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Negligible screening effect of $4f$ orbitals

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(A) The lanthanoid contraction is primarily due to the poor shielding effect of $4f$ electrons. Because the $4f$ orbitals have a diffuse shape,they are ineffective at shielding the outer electrons from the increasing nuclear charge as we move across the lanthanoid series. Consequently,the effective nuclear charge increases,causing the atomic and ionic radii to decrease steadily.

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