radon
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-226. Radon itself decays into polonium. Used in radiotherapy. As a noble gas, it is effectively inert, though radon fluoride has been synthesized. First isolated in 1908 by Ramsey and Gray.

Elements of periodic system. 2013.

  • radon — radon …   Dictionnaire des rimes

  • 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

  • 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 …   The Collaborative International Dictionary of English

  • 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 — 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