Question

The number of unpaired electrons in $C{u}^{+}$ $(atomicnumber=29)$ is:

• A. 1
• B. 2
• C. 0.0
• D. 3

Answer 1

The correct option is C 0.0

The ground state electronic configuration of $Cu$ is
$=1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{1}3d^{10}$

Thus the electronic configuration of $C{u}^{+}$ is
$=1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{10}$

Since all orbitals are completely filled, the number of unpaired electron in $C{u}^{+}$ is zero