Julie S. answered 01/16/17
Tutor
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Master's in Chemistry with 20+ Years of Teaching/Tutoring Experience
Mike - I can tell you the order of reactivity for these specific nonmetals, I<Br<Cl, therefore, Cl is the most reactive nonmetal in this list. But unless you know WHY this is the case, I'm not sure how helpful that is to you.
If you want to know more about the periodic table and trends in reactivity (and some of the reasons behind them), I would be happy to go over that with you in a tutoring session. :) https://www.wyzant.com/Tutors/JulieTheChemTutor
Good luck with your studies!