Radon Ra"don (r[=a]"d[o^]n), n. (Chem.) An intensely radioactive gaseous element produced by the radioactive decay of radium-226, which is the main isotope of radium found in pitchblende. Chemically it is an inert noble gas. Its atomic symbol is Rn. It has an atomic number of 86. The radon isotope produced by decay of radium has an atomic weight of 222.017, and this isotope decays by alpha emission with a half-life of 3.82 days. Numerous other isotopes have been observed, all radioactive and all having half-lives shorter than that of radon-222. Radon was discovered by M. and Mme. Curie, of Paris, in their studies of the radioactive substances in pitchblende. Radon was originally called {radium emanation} or {exradio}. [PJC]

The Collaborative International Dictionary of English. 2000.

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  • Radón — Saltar a navegación, búsqueda Astato Radón Francio Xe Rn Uuo       Tabla completa …   Wikipedia Español

  • radon — RADÓN s.n. Element chimic gazos cu proprietăţi radioactive, format prin dezintegrarea radiului. – Din fr. radon. Trimis de LauraGellner, 02.07.2004. Sursa: DEX 98  RADÓN s. (chim., fiz.) emanaţie de radiu. (radon este un element chimic… …   Dicționar Român

  • radon — [ radɔ̃ ] n. m. • 1923; de radium ♦ Phys. Élément radioactif naturel (Rn; no at. 86), gaz rare produit par la désagrégation des isotopes du radium. ● radon nom masculin Élément radioactif de masse atomique 222, de numéro atomique 86. (C est le… …   Encyclopédie Universelle

  • radón — elemento radioactivo gaseoso generado por la desintegración del radio Diccionario ilustrado de Términos Médicos.. Alvaro Galiano. 2010. radón (Rn) Elemento no metálico, radiactivo, inerte …   Diccionario médico

  • radon — Symbol: Rn Atomic number: 86 Atomic weight: (222) Colorless radioactive gaseous element, belongs to the noble gases. Of the twenty known isotopes, the most stable is Rn 222 with a half life of 3.8 days. Formed by the radioactive decay of Radium… …   Elements of periodic system

  • Radon — er et grundstof. Radon findes i alle radioaktive mineraler …   Danske encyklopædi

  • rádon — s. m. [Química] Elemento químico gasoso radioativo (símbolo Rn), de número atômico 86. = RADÃO • [Brasil] Plural: rádones ou rádons. • [Portugal] Plural: rádones.   ‣ Etimologia: francês radon …   Dicionário da Língua Portuguesa

  • Radon — См. Радон Термины атомной энергетики. Концерн Росэнергоатом, 2010 …   Термины атомной энергетики

  • radon — (n.) heaviest gaseous element, 1918, from RADIUM (Cf. radium) (q.v.) + on suffix of inert gases. The element was identified in radioactive decay of radium. Alternative name niton (from L. nitens shining ) gained currency in France and Germany …   Etymology dictionary

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