How would you account for the following ? Among lanthanoids, Ln (III) – InterviewSolution

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1.	How would you account for the following ? Among lanthanoids, Ln (III) compounds are predominant . However, occasionally in solutions or in the solid compounds , `+2` and `+4 ` ions are alos obtained.
Answer» `+2` and `+4` oxidation states are shown by those elements which by losing 2 or 4 electrons acquire a stable configureation of `f^(0), f^(7) ` or `f^(14)` , e.g., `Eu^(2+)` is `[Xe] 4f^(7), Yb^(2+)` is `[Xe4f^(14) , Ce^(4+) ` is `[Xe]4f^(0)` and `Tb^(4+)` is `[Xe]4f^(7)`

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