F:Like chlorine, fluorine is also a highly reactive nonmetal that readily forms bonds. Fluorine only needs one more electron to complete its outermost energy level.
Br: Bromine shares similarities with chlorine and fluorine since it belongs to the same group of elements. It readily forms bonds and has seven electrons in its outermost energy level.
I: Iodine is another member of the halogen family, just like chlorine and bromine. It can form bonds by gaining one electron to complete its outermost energy level.