Chemistry Among the halogens the rare element is________________? Options:A. FluorineB. ChlorineC. AstatineD. IodineView AnswerC. Astatine Continue Reading Previous: By which method the molecular mass of benzene was determined as 78.108 ?Next: Water gas heated at 450?C and 200 atm pressure in the presence of ZnO+Cr2O3 will produce________________?