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Actinoid contraction is greater from ele...

Actinoid contraction is greater from element to element than lanthanoid contraction. Why?

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The decrease in atomic (or ionic) radii (actinoid contraction) in actinoids is greater than lanthanoid contraction because 5f -electrons have poor shielding effect as compared to 4f -electrons. Therefore, the effect of increased nuclear charge leading to contraction in size is more in case of actinoids.
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