radon

Etymology
Contraction of radium emanation, since the element appears in the radioactive decay of radium.

Noun

 * 1) The chemical element (symbol, formerly ) with atomic number 86. It is an odorless, colorless, chemically inert but radioactive noble gas.
 * 2) Radon-222, the most stable  of said element.

Usage notes
The isotopes $222$Rn, $220$Rn, and $219$Rn were discovered independently, and were called radon, thoron , and actinon 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 $220$Rn today; actinon is mostly obsolete, because $219$Rn is short-lived.

Translations

 * Afrikaans:
 * Arabic: رَادُون
 * Armenian:
 * Asturian:
 * Basque: radona
 * Belarusian: радо́н
 * Bulgarian: радо́н
 * Catalan:
 * Chinese:
 * Mandarin:
 * Czech:
 * Danish:
 * Dhivehi:
 * Dutch:
 * Esperanto:
 * Estonian:
 * Faroese: radon
 * Finnish:
 * French:
 * Friulian: radon
 * Galician:
 * Georgian: რადონი
 * German:
 * Greek:
 * Hebrew:
 * Hindi: तैजसाति
 * Hungarian:
 * Icelandic:
 * Irish: radón
 * Italian: ,
 * Japanese:
 * Kashubian: redón
 * Kazakh: радон
 * Khmer: រ៉ាដុង
 * Korean:
 * Latvian: radons
 * Lithuanian:
 * Luxembourgish: Radon
 * Macedonian: радон
 * Malay: radon
 * Maltese: radon
 * Manx: raadon
 * Mongolian:
 * Norwegian: radon
 * Occitan:
 * Persian:
 * Polish:
 * Portuguese:
 * Romanian:
 * Russian:
 * Serbo-Croatian:
 * Cyrillic: радон
 * Roman:
 * Slovak:
 * Slovene:
 * Spanish:
 * Swedish:
 * Tajik: радон
 * Tamil: ரேடோன்,
 * Thai: เรดอน
 * Turkish:
 * Ukrainian: радо́н
 * Uzbek: ,
 * Vietnamese: rađơn
 * Volapük:
 * West Frisian: radon


 * Albanian:
 * Breton:
 * Cornish:
 * Lithuanian:
 * Welsh:

Noun

 * 1) radon

Etymology
From.

Etymology
.

Noun

 * 1) radon

Noun

 * 1) radon

Etymology
From.

Noun

 * 1) radon

Noun

 * 1) radon

Noun

 * 1)  chemical element

Noun

 * 1) radon

Etymology
From.

Noun

 * 1) radon chemical element

Etymology
.

Noun

 * 1)   chemical element

Noun

 * 1) radon

Etymology
.

Noun

 * 1) radon

Etymology
Borrowed from.

Noun

 * 1) radon

Etymology
Borrowed from.

Noun

 * 1) radon