J.R. S. answered 05/23/19
Ph.D. University Professor with 10+ years Tutoring Experience
Cl- is the chloride anion which has filled the valence shell and has the argon configuration. Chlorine radical (Cl•) has 7 valence electrons (an unpaired valence electron exists) making it a radical. So, all radicals are not ions, as shown by the neutral chlorine radical.