Question

What is the number of electrons in the valence shell of chlorine?

Hint:

The number of valence electrons determines the group number for main group elements. With 7 valence electrons, chlorine is in Group 17 of the periodic table (the halogens).

Answer 1

The valence shell is the outermost electron shell of an atom. For chlorine, with the electronic configuration 2, 8, 7, the outermost shell is the third shell (M shell). This shell contains 7 electrons. These are the valence electrons, which are involved in chemical bonding.