# What is the electron configuration of Sc+3?

Jul 20, 2018

You got scandium...$Z = 21$, i.e. 18 electrons to distribute in the trication.
And so we follow the usual $\text{Aufbau scheme}$...
${\underbrace{1 {s}^{2} 2 {s}^{2} 2 {p}^{6} 3 {s}^{2} 3 {p}^{6} 4 {s}^{2} 3 {d}^{1}}}_{\text{electronic configuration of scandium metal}}$
${\underbrace{1 {s}^{2} 2 {s}^{2} 2 {p}^{6} 3 {s}^{2} 3 {p}^{6}}}_{\text{electronic configuration of scandium trication}}$