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The d- and f-Block Elements — Chemistry STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 ScienceChemistryThe d- and f-Block Elements1 Mark
Question
Actinoid contraction is more than lanthanoid contraction, why?
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Answer

Due to weak shielding effect of 5 f electrons, actinoid contraction is more than lanthanoid contraction.

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