Question

Which of the following lanthanoid ions is diamagnetic?

• A. $S{m}^{2+}$
• B. $C{e}^{2+}$
• C. $Y{b}^{2+}$
• D. $E{u}^{2+}$

Answer 1

Answer: (C)

$Y{b}^{2+}$

$Y{b}^{2+}$ is diamagnetic as it lacks unpaired electrons.
$Yb$ has outer electronic configuration of $4f^{14}5d^{0}6s^2$.
$Y{b}^{2+}$ has outer electronic configuration of $4f^{14}5d^{0}6s^0$