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Actinoid contraction is greater from ele...

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

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The 5f electrons are more effectively shielded from nuclear charge. In other words the 5f electrons themselves provide poor shielding from element to element in the series.
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(A): Elements of second and third transition series have nearly same atomic radii (R): Lanthanide contraction is observed in the elements from atomic number 58 to 71.