Question

For which among the following species magnetic moment is $\sqrt{3}$ Bohr Magneton?

• A. $N{i}^{2+}$
• B. $C{u}^{+}$
• C. $C{u}^{2+}$
• D. $S{c}^{2+}$

Answer 1

Answer: (C), (D)

The correct options are
C $C{u}^{2+}$
D $S{c}^{2+}$

$\sqrt{3}=\sqrt{n(n+2)}$
$\therefore n=1$
$N{i}^{2+}$ $\to$ Electronic configuration
$1S^{2}2S^{2}2P^{6}3S^{2}3P^{6}3d^8$

2 - unpaired electrons
n = 2
$C{u}^{+}-1S^{2}2S^{2}2P^{6}3S^{2}3P^{6}3d^{10}$
0 unpaired electrons
n = 0
$C{u}^{2+}-1S^{2}2S^{2}2P^{6}3S^{2}3P^{6}3d^9$

$S{c}^{2+}-1S^{2}2S^{2}2P^{6}3S^{2}3P^{6}3d^1$
Unpaired $e^{-}=1$ n = 1.