Question

Which of the following oxidation state is common for all lanthanides?

• A. $+2$
• B. $+3$
• C. $+4$
• D. $+5$

Answer 1

Answer: (B)

$+3$

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.

Hence, option B is correct.