hydrogen atom

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Related to hydrogen-1: hydrogen-2
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Noun1.hydrogen atom - an atom of hydrogenhydrogen atom - an atom of hydrogen      
hydrogen ion - a positively charged atom of hydrogen; that is to say, a normal hydrogen atomic nucleus
atom - (physics and chemistry) the smallest component of an element having the chemical properties of the element
acid hydrogen, acidic hydrogen - a hydrogen atom in an acid that forms a positive ion when the acid dissociates
deuterium, heavy hydrogen - an isotope of hydrogen which has one neutron (as opposed to zero neutrons in hydrogen)
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References in periodicals archive ?
Hydrogen has an atomic weight of very close to 1, so that if it did consist of isotopes, hydrogen-1 must be overwhelmingly the most common.
He reasoned that hydrogen-2, being the more massive atom, would be less easily evaporated than hydrogen-1. If, then, he slowly evaporated a large quantity of liquid hydrogen, the final bit of liquid ought to have a percentage of hydrogen-2 larger than that in the supply he began with.
Hydrogen-2 fused at a lower temperature than hydrogen-1, and hydrogen-3 fused at a lower temperature still.