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  4. Which of the following oxidation states is common for all lanthanides ?

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Q. Which of the following oxidation states is common for all lanthanides ?

J & K CETJ & K CET 2002The d-and f-Block Elements

Solution:

Elements of lanthanide series generally show the oxidation state of +3.
Metals of lanthanides show the oxidation state of +2 in the solutions of their complex compounds. Some of the lanthanides also exhibit oxidation state of +4 occasionally.
This unequal distribution of oxidation state of these metals is due to the high stability of empty, half-filled or fully filled f-subshells.