| NOUN | substance | hydrogen atom | an atom of hydrogen |
|---|
| Meaning | An atom of hydrogen. | |
|---|---|---|
| Parts | hydrogen ion | A positively charged atom of hydrogen |
| Narrower | acidic hydrogen, acid 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) | |
| Broader | atom | (physics and chemistry) the smallest component of an element having the chemical properties of the element |
| Spanish | átomo de hidrógeno | |
| Catalan | àtom d'hidrogen | |
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