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Byju's Answer
Standard XII
Chemistry
Shielding Effect
Reason of lan...
Question

Reason of lanthanoid contraction is:

A
Negligible screening effect of f-orbitals
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B
Increasing nuclear charge
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C
Decreasing nuclear charge
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D
Decreasing screening effect
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Solution

The correct option is A Negligible screening effect of f-orbitals
Due to poor shielding/screening of f-orbitals, nucleus will exert a strong attraction, causes lanthanoid contraction. Due to this lanthanoid contraction, the size of group of 4d and 5d transition elements are almost same.

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