Question

The paramagnetic element is:

• A. $N{i}^{2+}$
• B. $S{c}^{3+}$
• C. $C{u}^{+}$
• D. $Z{n}^{2+}$

Answer 1

Answer: (A)

The ions having unpaired electron are paramagnetic. The ions having Paired electrons are diamagnetic.

(a) $N{i}^{2+}=1s^2,2s^2,2p^6,3s^2,3p^6,4s^0,3d^8$
$\therefore$ It has 2 unpaired electrons and is paramagnetic.
(b) $S{c}^{3+}=1s^2,2s^2,2p^6,3s^2,3p^6,4s^0,3d^0$
$\therefore$ It has no unpaired electrons and is diamagnetic
(c) $C{u}^{+}=1s^2,2s^2,2p^6,3s^2,3p^6,4s^0,3d^{10}$
$\therefore$ It has no unpaired electrons and is diamagnetic.
(d) $Z{n}^{2+}=1s^2,2s^2,2p^6,3s^2,3p^6,4s^0,3d^{10}$
$\therefore$ It has no unpaired electrons and is diamagnetic.