Since no choices are given, I will describe the reactivity of the element chlorine. A halogen is example of nonmetal. When compounds containing halogens they are called salts thus the name “salt – former”. Halogen consists of Fluorine, Chlorine, Bromine, Iodine, Astatine. An example of is reactivity is the monochlorination of an alkane, which involves substituting one of the hydrogen atom in the alkane and exchange it with a chlorine atom.
CH₄ + Cl₂ → CH₃Cl + HCl
The H in methane is substituted with the Cl in chloride.