Neon has 10 protons and 10 electrons. How many additional electrons would it take to fill the outer (second) electron shell?

1 Answer
Feb 16, 2017



Neon is a noble gas. The noble gasses all have filled outer electron shells.

Put another way, the number of electrons that can be put in any shell is #2n^2# so, for the n=1 shell you get #2xx1^2# or 2 electrons. for the n=2 shell you get #2 xx 2^2# or eight electrons.


That's neon.