Lanthanoid contraction is caused due to

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(B) The main reason for lanthanoid contraction is the poor shielding of the outer shell electrons by $4f$ electrons.Because the $4f$ orbitals have a d

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the imperfect shielding on outer electrons by $4f$ electrons from the nuclear charge

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(B) The main reason for lanthanoid contraction is the poor shielding of the outer shell electrons by $4f$ electrons.Because the $4f$ orbitals have a diffuse shape,their shielding effect is imperfect.Consequently,the effective nuclear charge experienced by the outer electrons increases,causing the nucleus to attract the outer shell electrons more strongly,which leads to a decrease in atomic and ionic radii across the lanthanoid series.

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