Chemistry - GENERAL CHEMISTRY Question with Solution | TestHub

The electronic configuration $[Ar]3d^{5}4s^1$ means the element has the electron configuration of Argon (18 electrons) plus an additional 6 electrons ($3d^{5}4s^1$). Total number of electrons = $18+5+1=24$.

An atom with 24 electrons is Chromium (Cr), which has an atomic number of 24. This configuration is an exception to the Aufbau principle, where one electron from the 4s orbital promotes to the 3d orbital to achieve a more stable half-filled 3d subshell.