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

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

TS EAMCET 2020

Solution:

Lanthanide contraction is the steady decrease in size of atoms and ions of rare earth elements with increasing atomic number from lanthanum.
(Atomic number $=57$ )
It is caused by poor shielding effect of $4 f$-electrons. In row $3$ , we have $4 f$-electrons which do not shield good, causing a greater nuclear charge.
This greater nuclear charge has a greater pull on electrons.
Thus, we can say that decrease in atomic radii is the effect of lanthanoid contraction in lanthanoid series.