Copper atomic number is 29 and it’s electronic configuration is

The elements which have half filled or full filled orbitals having more energy than other electronic configuration. Regarding the element copper (Cu) with the atomic number 29 has the stable electronic configuration  $1{\text{s}}^{2}2{\text{s}}^{2}2{\text{p}}^{6}3{\text{s}}^{2}3{\text{p}}^{6}4{\text{s}}^{1}3{\text{d}}^{10}$ by fulfilled orbital.