# What is the electron configuration of a Mn atom in the ground state?

$\left[A r\right] 4 {s}^{2} 3 {d}^{5}$
Mn has an atomic number of 25. Simply use this information to obtain its electronic configuration. Mn: $1 {s}^{2} 2 {s}^{2} 2 {p}^{6} 3 {s}^{2} 3 {p}^{6} 4 {s}^{2} 3 {d}^{5}$ or simply $\left[A r\right] 4 {s}^{2} 3 {d}^{5}$ .