Question

What is the ment by lanthanoid contraction. Explain the probable cause of this contraction?

Answer 1

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$\huge\mathfrak{\blue{Answer→}}$The Lanthanide Contraction is caused by a poor shielding effect of the 4f electrons. Gd because as atomic number increases, the atomic radius decreases.These electrons are do not shield good, causing a greater nuclear charge. This greater nuclear charge has a greater pull on the electrons.

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