Halogens Halogens: 11.2.1 Position of the halogens in the periodic table The halogens (fluorine, chlorine, bromine and iodine) form a family of elements that are closely related. They are placed in group 7 of the periodic table. 11.2.2 Laboratory preparation of the halogens: (a) Chlorine Chlorine is the second member of the group and its reactions are typical of the halogens. It is prepared in the laboratory by the oxidation of concentrated hydrochloric acid with manganese(IV) oxide. The mixture is …