Organic compounds containing these materials include the horribly toxic PCBs and PFCAs. The heaviest one, the rarest element in Earth's crust, is produced by decay of radium and polonium. A detector which turns starches blue, Lugol's reagent, is a potassium salt of one of these elements; that element, when bonded to silver, can be used in cloud seeding. The lightest member of this group was the first discovered to form bonds with xenon, and it is the only group to include solid, liquid, and gas elements at standard temperature and pressure. As free radicals, they deplete the ozone layer. For 10 points, name this group of elements including astatine, iodine, and chlor
Organic compounds containing these materials include the horribly toxic PCBs and PFCAs. The heaviest one, the rarest element in Earth's crust, is produced by decay of radium and polonium. A detector which turns starches blue, Lugol's reagent, is a potassium salt of one of these elements; that element, when bonded to silver, can be used in cloud seeding. The lightest member of this group was the first discovered to form bonds with xenon, and it is the only group to include solid, liquid, and gas elements at standard temperature and pressure. As free radicals, they deplete the ozone layer. For 10 points, name this group of elements including astatine, iodine, and chlorine, the column to the left of noble gases on the periodic table.
Organic compounds containing these materials include the horribly toxic PCBs and PFCAs.
halogens [accept group 17 or family 17; prompt "group 7A" or "family 7A"]