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  • Reason of lanthanoid contraction is :Option: 1 Negligible screening effect of 'f' orbitals<div class='qna-option'

Reason of lanthanoid contraction is :

Option: 1

Negligible screening effect of 'f' orbitals


Option: 2

Increasing Nuclear charge


Option: 3

Decreasing nuclear charge


Option: 4

Decreasing screening effect


Answers (1)

best_answer

The lanthanoid contraction results from the poor shielding effect of the 4f orbitals due to which outer 6s electrons are more strongly attracted by the nucleus thus resulting in a decrease in size of the atoms subsequent to lanthanoids i.e from hafnium. 

The correct answer is option 1. 

Posted by

Divya Prakash Singh

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