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Explain briefly the cause of Lanthanoid contraction

Explain briefly the cause of Lanthanoid contraction

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Anjali Ahuja
askIITians Faculty 234 Points
9 years ago
Hi student
The major cause for lanthanide contraction is due to the inappropriate shielding of the 4f electrons due to the improper shape of the f-orbitals. As the atomic number increases in the lanthanide series, for every proton in the nucleus the extra electron goes to fill the 4f-orbitals.
This results in gradual decrease in the size of lanthanides with increasing atomic number. The decrease in size is not regular throughout the lanthanides. A rapid decrease is seen only in the first six elements compared to the rest of the elements.

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