# What is the electron configuration for Mn^(3+)?

For manganese, $Z$ $=$ $25$.
Electron configuration: $1 {s}^{2} 2 {s}^{2} 2 {p}^{6} 3 {s}^{2} 3 {p}^{6} 4 {s}^{2} 3 {d}^{5}$
For $M {n}^{3 +}$, the $s$ electrons are removed FIRST, to yield a configuration of $1 {s}^{2} 2 {s}^{2} 2 {p}^{6} 3 {s}^{2} 3 {p}^{6} 3 {d}^{4}$.