Aufbau principle does not give the correct arrangement of filling up of the atomic orbitals in

Aufbau principle does not give the correct arrangement of filling up of atomic orbitals in copper and chromium because half-filled and completely filled electronic configuration of Cr and Cu have lower energy and therefore, more stable.Cr(Z=24)=1s2,2s22p6,3s23p63d5,4s1Cu(Z=29)=1s2,1s22p6,3s23p63d10,4s1