Halogen Compounds of Chlorine, Bromine, Iodine and Astatine

A majority of the halides of the pretransition metals in groups 1 and 2 of the periodic table, as well as those of the lanthanides and actinides at the valence states of +2 and +3, are usually ionic compounds - http://www.science-chemistry.com/halogen-compounds-of-chlorine-bromine-iodine-and-astatine