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  4. Reason of lanthanoid contraction is

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Q. Reason of lanthanoid contraction is

NTA AbhyasNTA Abhyas 2022

Solution:

As inner d or f orbital electrons are located deep inside due to highly diffused shapes of these orbitals. So they exert low repulsion that is poor screening. It means due to poor shielding of f-orbitals nucleus will exert a stronger attraction causing lanthanoid contraction.