radon
From Wiktionary, the free dictionary
See also: Appendix:Variations of "radon"
| Chemical element | |
|---|---|
| Rn | |
| Previous: astatine (At) | |
| Next: francium (Fr) | |
Etymology
Contraction of radium emanation, since the element appears in the radioactive decay of radium.
Pronunciation
- enPR: rā'dŏn, IPA(key): /ˈɹeɪdɒn/
Audio (Southern England): (file)
Noun
radon (uncountable)
- The chemical element (symbol Rn, formerly Ro) with atomic number 86. It is an odorless, colorless, chemically inert but radioactive noble gas.
- Radon-222 (22286Rn), the most stable isotope of said element.
Usage notes
The isotopes 222Rn, 220Rn, and 219Rn were discovered independently, and were called radon (Rn), thoron (Tn), and actinon (An) respectively. In 1957, it was finally decided that the name radon should refer to the element in general, regardless of isotope. Thoron still survives as a name for 220Rn today; actinon is mostly obsolete, because 219Rn is short-lived.[1]
Synonyms
a chemical element
radon-222; an isotope of radon
Hyponyms
a chemical element
Derived terms
- eka-radon
- radon difluoride
- radon fluoride
- radon seed
Related terms
Translations
chemical element
|
- The translations below need to be checked and inserted above into the appropriate translation tables. See instructions at Wiktionary:Entry layout § Translations.
See also
- actinon
- radium emanation
References
- Radon on the British Royal Society of Chemistry's online periodic table
Anagrams
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