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How many valence electrons are in an atom of chlorine?
Chlorine has 7 valence electrons .
The of chlorine is ##1s^2 2s^2 2p^6 3s^2 3p^5## or ##"[Ne]"3s^2 3p^5##.
The ##3s^2 3p^5## electrons are the outermost electrons, so chlorine has seven .
In a picture, the valence electrons are the ones in the outermost shell.
You can see in the diagram below that there are seven electrons in the outermost circle.
Additionally, a more basic way of determining the number of would be to simply look at what group Cl is in.
It is in Group 17, which means it has 7 valence electrons.