Which of the following factors may be regarded as the main cause of la – InterviewSolution

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1.	Which of the following factors may be regarded as the main cause of lanthanoide contraction?
Answer» Greater shielding of 5d ELECTRONS by 4F electrons POORER shielding of5d electrons by 4felectrons Effective sb ielding of one of 4f electrons by ANOTHER in the subshell Poor shielding of one of 4felectron by another in the subshell Solution :In lanthanides, there is poorer shielding of 5d electrons by 4f electrons resulting in greater attraction of the NUCLEUS over 5 d electrons and contraction of the atomic radii.

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