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NCERT Class XII Chemistry
Chapter - The d- and f-Block Elements
Questions with Solutions

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Question : 48
Total: 49
Actinoid contraction is greater from element to element than lanthanoid contraction. Why?
Solution:  
The 5f electrons are more effectively shielded from nuclear charge.In other words the 5f electrons themselves provide poor shielding fromelement to element in the seriest.
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