Are non-valence electrons represented in a Lewis dot diagram?
Only valence electrons are represented in Lewis dot diagrams. Never draw electrons other than valence electrons.
The electronic configuration for chlorine is,
E.C :- K=2, L=8,M=7
The lewis dot diagram for chlorine is,
In the electron configuration above the last shell that is the M shell has 7 electrons in it and the diagram above also 7 electrons are drawn.