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an atom of hydrogen

a hydrogen atom

atomic hydrogen

ionic hydrogen

a molecular component ion called a hydrogen ion

a positively charged atom of hydrogen

a gaseous element called hydrogen

atom

the nucleus of deuterium

hydrogen gas

sulphuretted hydrogen

diatomic

a condition of containing many hydrogen atoms

nitrous acid

an atom of carbon

ammonium hydroxide

radioactive isotope

sulfuretted hydrogen

a sub-nuclear, elementary particle, called {hadron}

heavy hydrogen

heavy hydrogen

an ion or radical derived from ammonia and by combination with a hydrogen ion or atom, called ammonium

ammoniated mercury

humic acid

a hydride

both atomic and hydrogen bombs

in chemistry, a group of atoms, called an acid radical

subatomic particles

the composition of the hydrogen atom

an isotope of hydrogen, called deuterium