halogens are highly reactive. Because they lack only one electron in their outer shell to be complete, they will readily form compounds with other elements. Most of the time, these elements will also form salts with metals. they are very poor conductors of heat and electricity and are non-metals. they can be found in group 17 of the periodic table.
Fluorine
Chlorine
Bromine
Iodine
Astatine
Chlorine
Bromine
Iodine
Astatine