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alkali alloys alpha rays aluminum American Chemical Society ammonia amount antimony arsenic atoms barium bromine caesium calcium calcium carbide carbon dioxide cent Chem Chemical Education chemist Chemistry Club Chemistry Leaflet chlorine colloidal color commercial compounds consumer containing copper crystals Division of Chemical electric electrons element Engineering fibers furnace gases glass gold heat helium hydrogen important increase industry iodine iron laboratory lead liquid air manufacture material ment mesothorium metal method metric tons milk mineral Mines nitrate nitrogen obtained oxide oxygen Pauline G phosphate phosphorus plant platinum potassium pounds present production quantities radium rays recent Relatives rubber salt School Science Service silk soda sodium solution steel substances sugar sulfate sulfuric acid supply synthetic temperature tion tube ture United vitamin Volume weight wool World Trade Notes X-ray York zinc