What is lanthanoid contraction? What are the consequences of lanthano

1.	What is lanthanoid contraction? What are the consequences of lanthanoid contraction?
Answer» The regular decrease in atomic radii due to the filling of 4f before 5d orbitals is called lanthanoid contraction. This is because of the imperfect shielding of one electron by another in the same set of orbitals. The shielding of one 4f electron by another is less than that of one d electron by another, and as the nuclear charge increases along the series, there is fairly regular decrease in the size of entire 4f orbitals. Consequences of lanthanoid contraction. Radii of third series are virtually same as those of the corresponding member of second series. Third series and second series have very similar physical and chemical properties much more than that expected by usual family relationships.

What is lanthanoid contraction? What are the consequences of lanthanoid contraction?

Answer»

The regular decrease in atomic radii due to the filling of 4f before 5d orbitals is called lanthanoid contraction. This is because of the imperfect shielding of one electron by another in the same set of orbitals. The shielding of one 4f electron by another is less than that of one d electron by another, and as the nuclear charge increases along the series, there is fairly regular decrease in the size of entire 4f orbitals. Consequences of lanthanoid contraction.

Radii of third series are virtually same as those of the corresponding member of second series.
Third series and second series have very similar physical and chemical properties much more than that expected by usual family relationships.

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What is lanthanoid contraction? What are the consequences of lanthanoid contraction?

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