| NOUN | substance | radon, Rn, atomic number 86 | a radioactive gaseous element formed by the disintegration of radium |
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| Sounds | rey'daa.n | |
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| Rhymes | Abidjan ... Yukon: 149 rhymes with aan... | |
| Meaning | A radioactive gaseous element formed by the disintegration of radium; the heaviest of the inert gasses; occurs naturally (especially in areas over granite) and is considered a hazard to health. | |
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| Synonyms | Rn, atomic number 86 | |
| 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 |
| noble gas, inert gas, argonon | Any of the chemically inert gaseous elements of the helium group in the periodic table | |
| Spanish | número atómico 86, radon, radón, Rn | |
| Catalan | número atòmic 86, radó, Rn | |
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