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

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

NEETNEET 2022The d-and f-Block Elements

Solution:

$5 f$ have poor shielding effect so more will be $Z_{\text {eff }}$ At. size $\propto \frac{1}{Z_{\text {eff }}}$