For chromium, the electronic configuration is [Ar]3d⁵4s¹ instead of [Ar]3d⁴4s². This is because orbitals that are fully ftlled or half ftlled have extra stability due to their symmetrical charge distribution For copper, the electronic configuration is [Ar]3d¹⁰4s¹ instead of [Ar]3d⁹4s². The reason is the same as stated in (iii).
May 08, 2020 · Chromium has an atomic mass of 51.9961 u. Chrome’s electronic configuration is [Ar] 3d54s1. The electronic configuration of the elements, determines the form in which the electrons are structured in the atoms of an element.