• # question_answer Chromium has the electronic configuration $4{{s}^{1}}3{{d}^{5}}$ rather than $4{{s}^{2}}3{{d}^{4}}$ because A)                 $4s$ and $3d$ have the same energy B)                 $4s$ has a higher energy than $3d$ C)                 $4{{s}^{1}}$ is more stable than $4{{s}^{2}}$ D)                 $4{{s}^{1}}3{{d}^{5}}$ half-filled is more stable than $4{{s}^{2}}3{{d}^{4}}$

$Cr$ has $\left[ Ar \right]\,4{{s}^{1}}3{{d}^{5}}$ electronic configuration because half filled orbital are more stable than other orbitals.