# What is the noble gas notation for the electron Br?

For example, if I wrote out the full electron configuration for a sodium atom, it would be $1 {s}^{2} 2 {s}^{2} 2 {p}^{6} 3 {s}^{1}$. But if I instead use noble gas notation, everything in the 1st and 2nd shells (the core electrons) would be designated as being equivalent to Neon, the closest noble gas that occurs before sodium on the periodic table. so using noble gas notation, the electron configuration of sodium becomes $\left[N e\right] 3 {s}^{1}$.