Electron shells in chemistry?

W

Wilbert E

New member
I have no idea, how to do this can someone explain?

The question is asking....

How many electron shells would be completely filled by a neutral atom of chlorine?

And how many will be left over?

Options:
a. 1 shell filled, 7 electrons left
b. 1 shell filled, 1 electron left over
c. 2 shells filled, 7 electrons left
d. 2 shells filled, 1 electron left over

And it states that Chlorine is element number 17 and is located in the third row and next to the last group on the periodic table! (Not sure if you would need this?!?)
 
Hey folks, it's the 21st century now. It's time we moved on from "shells". The shell concept is a bit archaic. We tend to use "energy levels" and "sublevels" these days.

A chlorine atom has the following electron configuration:
1s2, 2s2 2p6, 3s2 3p5

So, if a "shell" is supposed to be an "energy level" where all of the electrons in that "shell" have the same principal quantum number, then there are two filled shells and 7 electrons would be found in the next one.
 
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