Which element is likely to be the most reactive?

Question

bromine (Br)
chlorine (Cl)
fluorine (F)
iodine (I)

Answer 1

Fluorine (F) is likely to be the most reactive element among bromine (Br), chlorine (Cl), fluorine (F), and iodine (I). Reactivity in this context generally increases as you move up and to the right on the periodic table, and fluorine is located at the top of Group 17 (the halogens), making it the most reactive of the group.