Decrease in size from left to right in actino | vedclass

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(C) The decrease in atomic size across the actinoid series is more pronounced than in the lanthanoid series.This is because the $5f$ orbitals have a p

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$5f$ orbitals have poor shielding effect

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(C) The decrease in atomic size across the actinoid series is more pronounced than in the lanthanoid series.This is because the $5f$ orbitals have a poorer shielding effect compared to the $4f$ orbitals.Due to the poor shielding by $5f$ electrons,the effective nuclear charge $(Z_{eff})$ increases more significantly across the actinoid series.Since atomic size is inversely proportional to $Z_{eff}$ $(Size \propto \frac{1}{Z_{eff}})$,the size decreases more rapidly.

Decrease in size from left to right in actinoid series is greater and more gradual than that in lanthanoid series due to:

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