What is the effect of lanthanoid contraction | vedclass

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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?

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