The noble gas configuration of Silicon is [Ne] 3s23p2. The full electron configuration of silicon
is 1s22s22p63s23p2. 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. Now look at the periodic table and
find the noble gas at the end of the period the same as the number of filled
shells. The noble gas at the end of Period 2 is neon, Ne.
