# What is the noble gas shorthand of silicon?

[Ne] $3 {s}^{2} 3 {p}^{2}$
The full electron configuration of silicon is $1 {s}^{2} 2 {s}^{2} 2 {p}^{6} 3 {s}^{2} 3 {p}^{2}$. To find its noble gas shorthand, look at the full electron configuration and see how many filled shells there are. For silicon, all but the outermost shell is filled. So the number of filled shells is 2.