Class 12 Chemistry The d- and f-Block Elements Lanthanoids and Actinoids

Medium

What is the cause of lanthanoid contraction?

A
Poor shielding effect of outer electrons by $4f$ electrons.
B
Effective shielding effect of outer electrons by $5d$ electrons.
C
Same effective nuclear charge of elements from $Ce$ to $Lu$.
D
Imperfect shielding of outer electrons by $4f$ electrons.

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Class 12 Questions

Class 12

Chemistry Questions

Chapter

The d- and f-Block Elements

Subtopic

Lanthanoids and Actinoids

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