What is the effect of lanthanoid contraction | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) Lanthanoid contraction is the steady decrease in the size of atoms and ions of rare earth elements with an increasing atomic number from lanthanum

Vedclass · Accepted Answer

Decrease in atomic radii

Vedclass · Answer

(A) Lanthanoid contraction is the steady decrease in the size of atoms and ions of rare earth elements with an increasing atomic number from lanthanum $(Z = 57)$.It is caused by the poor shielding effect of $4f$-electrons.In the $4f$ series,the $4f$-electrons do not shield the outer electrons effectively from the nuclear charge.This results in a greater effective nuclear charge,which exerts a stronger pull on the electrons towards the nucleus.Thus,the decrease in atomic and ionic radii is the primary effect of lanthanoid contraction.Therefore,option $(A)$ is correct.

What is the effect of lanthanoid contraction in the lanthanoid series of elements with increasing atomic number?

Similar Questions

The lanthanoid that does $NOT$ show $+4$ oxidation state is

Explain lanthanoid contraction in detail. What is lanthanoid contraction? What are its consequences?

Which among the following properties of lanthanoids is $NOT$ true?

The number of $f$ electrons in the ground state electronic configuration of $Np$ $(Z=93)$ is ....... .

Which of the following lanthanoids shows $+4$ oxidation state to acquire noble gas configuration?
(At nos. : $La=57, Ce=58, Eu=63$ and $Yb=70$ )

Vedclass Test Series

Exam Paper Generator

Online Exam Module