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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 or contraction in atomic radii as well as ionic radii in actinoids elements ( actinoid contraction) is more as compared to lanthanoid contraction because 5f electrons have more 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 actinoid element.
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