Question

Which of the following lanthanide ion is paramagnetic?

• A. $C{e}^{4+}$
• B. $Y{b}^{2+}$
• C. $L{u}^{3+}$
• D. $E{u}^{2+}$

Answer 1

The correct option is D $E{u}^{2+}$

Electronic configuration of $E{u}^{2+}:\left[Xe\right]4f^7$

It contains unpaired $e^{-}s$, thus shows paramagnetic behaviour.