Write the Electronic Configuration for Cr 24 and Cu 29

Answer: Chromium is a 3d series element whose atomic number is 24. In this element, the electron does not fill into a 4s orbital, instead it fills into a 3d orbital as a half-filled orbital is more stable. So, the electronic configuration of chromium is 1s²2s²2p⁶3s²3p⁶4s¹3d⁵.

Copper is also a 3d series element whose atomic number is 29. In copper too, the electrons do not fill into 4s orbital, instead it fills into 3d orbital as a full-filled d orbital is more stable. Hence, the electronic configuration of copper is1s²2s²2p⁶3s²3p⁶4s¹3d¹⁰.