| NOUN | substance | atomic number 1, hydrogen, H | a nonmetallic univalent element that is normally a colorless and odorless highly flammable diatomic gas |
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| Meaning | A nonmetallic univalent element that is normally a colorless and odorless highly flammable diatomic gas; the simplest and lightest and most abundant element in the universe. | |
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| Synonyms | hydrogen, H | |
| Narrower | tritium | A radioactive isotope of hydrogen |
| Broader | chemical element, element | Any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter |
| gas | A fluid in the gaseous state having neither independent shape nor volume and being able to expand indefinitely | |
| Substance of | water, H2O | binary compound that occurs at room temperature as a clear colorless odorless tasteless liquid / liquid |
| Spanish | hidrógeno, número atómico 1 | |
| Catalan | hidrogen, número atòmic 1 | |
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