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

1 Answer
Andy Wolff
Feb 16, 2017

zero!

Explanation:

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.

#2+8=10#

That's neon.

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