Question

Which of the following ions are paramagnetic in character?

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

Answer 1

Answer: (C)

$Z{n}^{2+}:[Ar{]}^{18}3d^{10};A{g}^{+}:[Kr{]}^{36}4d^{10}$

$C{u}^{+}:[Ar{]}^{18}3d^{10};N{i}^{2+}:[Ar{]}^{18}3d^8$

As such $N{i}^{2+}$ has two unpaired electrons and is paramagnetic.