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The main factor for the cause of lanthanide contraction is poorer shielding of 5d electrons by 4f electrons.

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in Chemistry – Class 12 by (188k points)
The main factor for the cause of lanthanide contraction is poorer shielding of 5d electrons by 4f electrons.

(a) True

(b) False

The question was asked in an interview for internship.

My question is based upon Electronic Configurations of the D-Block Elements topic in portion D and F-Block Elements of Chemistry – Class 12

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Correct choice is (b) False

Easy explanation: Lanthanide contraction is the steady decrease in the size of the atoms with increasing atomic number from lanthanum (atomic number 57) through lutetium (atomic number 71). The Lanthanide Contraction is caused by a poor shielding effect of the 4f electrons. It’s due to lanthanide contraction, as the atomic number increases, the size of the lanthanide atoms and their tripositive ions decreases.

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