# When a potassium atom loses one electron to form an K^+ ion, the electron is lost from what orbital?

Nov 26, 2016

It is lost from $4 s$
The electron configuration of $K$ is: $1 {s}^{2} , 2 {s}^{2} , 2 {p}^{6} , 3 {s}^{2} , 3 {p}^{6} , 4 {s}^{1}$
The furthest orbital in $K$ is $4 s$, so the electron will be lost from $4 s$.