hydrogen atom

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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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