SCIENCE,SECURITY,NOTICE,ELEMENTAL,PREVIOUS,ELEMENT,NITROGEN,THE PERIODIC TABLE OF ELEMENTS,FLUORINE,OXYGEN,CLICK,ISOTOPE,DATA 8,OXYGEN 15,ATOMIC NUMBER 8,ATOMIC WEIGHT,MELTING POINT,C,OR 361,BOILING POINT,DENSITY,GRAMS,CUBIC,PHASE,ROOM TEMPERATURE,GAS,CLASSIFICATION,NON METAL,PERIOD,NUMBER 2,GROUP,NUMBER 16,NAME,CHALCOGEN,WHATS IN A NAME,THE GREEK,WORDS,GENES,MEAN,ACID,FORMING,SAY WHAT,PRONOUNCED,USES,CHEMISTS,PRIOR,DISCOVERY,FAILED,RECOGNIZE,DISTINCT,JOSEPH PRIESTLEY,CARL WILHELM SCHEELE,DISCOVERED,CREDIT,THE DISCOVERY,ABLE,PRODUCE,HEATING,MERCURIC OXIDE,PRIESTLEY,EXPERIMENTS,DEPHLOGISTICATED AIR,SCHEELE,FIRE AIR,ANTOINE LAVOISIER,BELIEVED,NECESSARY,ACIDS,THE THIRD,ABUNDANT ELEMENT,THE UNIVERSE,NEARLY,EARTHS ATMOSPHERE,HALF,THE MASS,EARTHS CRUST,THIRDS,THE HUMAN BODY,NINE,WATER,EXTRACTED,LIQUEFIED AIR,PROCESS,FRACTIONAL DISTILLATION,ELECTROLYSIS OF WATER,POTASSIUM CHLORATE,KCLO3,ELEMENTS,LIVING,ORGANISMS,COMBUSTION,IMPURITIES,PIG IRON,BURNED,AWAY,STREAMS,HIGH PRESSURE,STEEL,ACETYLENE,C2H2,FLAME,WELDING,LIQUID OXYGEN,LIQUID HYDROGEN,EXCELLENT,ROCKET FUEL,OZONE,THIN,LAYER,THE EARTH,SHIELDS,THE SURFACE,ULTRAVIOLET RADIATION,COMPONENT,HUNDREDS,THOUSANDS,ORGANIC COMPOUNDS,ABUNDANCE,TIMES,MILLIGRAMS,OCEANIC,LITER,NUMBER,STABLE ISOTOPES,VIEW,DATA,IONIZATION ENERGY,OXIDATION STATES,ELECTRON SHELL CONFIGURATION,PAGE,STEVE,CITATION,LINKING,INFORMATION,