Hydrogen: The most plentiful element in the universe and one present in all organic compounds. Hydrogen is a gas with an atomic number of 1 and the symbol H.

Two isotopes of hydrogen -- deuterium and tritium -- have been used as tracers in metabolic studies. Tritium is a long-lived weak emitter of radiation and can be easily incorporated in large molecules such as DNA , and is therefore much used for autoradiography in the laboratory.

Antoine Lavoisier coined the name hydrogen from the Greek hydro (water) + genes (forming), reflecting the fact that water is generated by the combustion of this element.

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