# How do you do shorthand notation for electron configuration?

And thus we have for $H e , Z = 2$, i.e. $1 {s}^{2}$. For $L i , Z = 3$, we could write $\left[H e\right] 2 {s}^{1}$; or for $N a , Z = 11$, $M g , Z = 12$, we could write....$\left[N e\right] 3 {s}^{1}$, or $\left[N e\right] 3 {s}^{2}$ respectively. All the chemistry is going to occur with respect to the valence electrons, and the inner core in largely inert.....