SCIENCE,SECURITY,NOTICE,ELEMENTAL,PREVIOUS,ELEMENT,HYDROGEN,THE PERIODIC TABLE OF ELEMENTS,LITHIUM,HELIUM,CLICK,ISOTOPE,DATA,HELIUM 4,ATOMIC NUMBER 2,ATOMIC WEIGHT,MELTING POINT,C,BOILING POINT,OR 452,DENSITY,GRAMS,CUBIC,PHASE,ROOM TEMPERATURE,GAS,CLASSIFICATION,NON METAL,PERIOD,NUMBER 1,GROUP,NUMBER 18,NAME,NOBLE GAS,WHATS IN A NAME,THE GREEK,GOD OF THE SUN,HELIOS,SAY WHAT,PRONOUNCED,USES,ABUNDANT ELEMENT,THE UNIVERSE,DISCOVERED,ON THE SUN,THE EARTH,PIERRE,JANSSEN,FRENCH,ASTRONOMER,YELLOW LINE,SPECTRUM,TOTAL SOLAR ECLIPSE,NORMAN LOCKYER,ENGLISH,WAVELENGTH,NANOMETERS,HYPOTHESIZED,MYSTERIOUS,YELLOW,EMISSION,UNKNOWN,THE HUNT,FIND,EARTH,SIR WILLIAM RAMSAY,SCOTTISH,CHEMIST,CONDUCTED,EXPERIMENT,MINERAL,URANIUM,CLEVITE,EXPOSED,MINERAL ACIDS,COLLECTED,GASES,SENT,SAMPLE,SCIENTISTS,SIR WILLIAM CROOKES,ABLE,SWEDISH,CHEMISTS,NILS LANGLET,PER THEODOR CLEVE,SAME TIME,RAMSAY,EARTHS ATMOSPHERE,TRACE,AMOUNT,GRAVITATIONALLY BOUND,TO THE EARTH,SPACE,ATMOSPHERIC,THE DECAY,RADIOACTIVE,ELEMENTS,EARTHS CRUST,ALPHA DECAY,TYPE,RADIOACTIVE DECAY,PARTICLES,ALPHA PARTICLES,ALPHA PARTICLE,HELIUM ATOM,ONCE,CAPTURES,ELECTRONS,SURROUNDINGS,EVENTUALLY,WORK,THE ATMOSPHERE,CRACKS,CRUST,NATURAL GAS,DEPOSITS,TEXAS,OKLAHOMA,KANSAS,HELIUM GAS,USED TO,BLIMPS,SCIENTIFIC,BALLOONS,PARTY BALLOONS,INERT,SHIELD,FOR ARC,WELDING,PRESSURIZE,THE FUEL,TANKS,LIQUID,ROCKETS,SUPERSONIC,OXYGEN,CREATE,NITROGEN,FREE ATMOSPHERE,DEEP SEA,SUFFER,CONDITION,NITROGEN NARCOSIS,LIQUID HELIUM,CRYOGENIC,MATERIAL,STUDY,SUPERCONDUCTIVITY,SUPERCONDUCTIVE,MAGNETS,THE DEPARTMENT OF,JEFFERSON LAB,OPERATE,ELECTRON ACCELERATOR,INERT GAS,COMBINE,ATTEMPTS,PRODUCE,ABUNDANCE,TIMES,MILLIGRAMS,OCEANIC,LITER,NUMBER,STABLE ISOTOPES,VIEW,IONIZATION ENERGY,OXIDATION STATES,ELECTRON SHELL CONFIGURATION,PAGE,STEVE,CITATION,LINKING,INFORMATION,