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Noun

hydrogen 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

Non-LTE approaches have provided considerable insight into the Balmer and Paschen series associated with the hydrogen spectrum of the Sun [64].

Liquid Metallic Hydrogen II. A critical assessment of current and primordial helium levels in the sun

Now if hydrogen-2 were present, its spectral lines ought to have slightly different wavelengths than those of hydrogen-1, and the ordinary hydrogen spectrum ought to have, accompanying each spectral line, a very faint one nearby--too faint to be sure of.

Deuterium

It had not seemed to have much significance at the time, but now Bohr could choose orbits for a hydrogen electron that would yield just those wave-lengths that the hydrogen spectrum displayed.

Quantized atom

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