The electronic configuration of ${\text{Cu}}^{+}$ is

Atomic number of copper (Cu) is 29.

Its electronic configuration is $1{\text{s}}^{2}2{\text{s}}^{2}2{\text{p}}^{6}3{\text{s}}^{2}3{\text{p}}^{6}4{\text{s}}^{1}3{\text{d}}^{10}$ or $\left[\text{Ar}\right]4{\text{s}}^{1}3{\text{d}}^{10}$.

If copper loses one electron from its valency shell it forms ${\text{Cu}}^{+}$ion.

Electronic configuration of ${\text{Cu}}^{+}$ is $\left[\text{Ar}\right]3{\text{d}}^{10}$.