Answer:
In the lanthanoid family, filling of
electrons takes place \[(n-2)\,f-\]orbitals i.e., \[4f\] orbitals whereas they
actually belong to sixth period (n = 6). This means that these 4/electrons are
shielded by the electrons present in the outer shells and are normally not
available for the bond formation. Therefore, chemistry of all lanthanoids
(similarly of actinoids) is identical. For more details, consult Section 8.4.
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