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alpha particles ammonia animals atoms Beery Biology birds bismuth body broadcast bromine calcium carbon carbon dioxide cells cellulose cent Chemical Education chemist chemistry CHEMISTRY LEAFLET chloride chlorine Clubs of America College colloidal color compounds copper Courtesy Journal developed dioxide discovery earth electric electrons elements energy experiments fibers gametophyte gases glass heat helium High School human hydrogen important including THE CHEMISTRY industry insects interesting iodine Journal of Chemical known laboratory light liquid Mack magnetic material ment metal method modern molecules National Broadcasting Company nature nitrogen nucleus organs oxide oxygen particles Pauline G Pennsylvania Pennsylvania State College perchloric acid phosphate photographic physical physicist plants pounds present produced protein protons races radio-active radium result salt Science Leaflet scientists Section sodium solution sporophyte structure Student Science Clubs substances sulfur sulfuric acid surface temperature tion tube United Vitamin Volume weight