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Author: langbot
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English[en]
Radon is a chemical element with the symbol Rn and atomic number 86. It is a radioactive, colorless, odorless, tasteless noble gas. It occurs naturally in minute quantities as an intermediate step in the normal radioactive decay chains through which thorium and uranium slowly decay into lead and various other short-lived radioactive elements. Radon itself is the immediate decay product of radium. Its most stable isotope, 222Rn, has a half-life of only 3.8 days, making it one of the rarest elements. Since thorium and uranium are two of the most common radioactive elements on Earth, while also having three isotopes with half-lives on the order of several billion years, radon will be present on Earth long into the future despite its short half-life. The decay of radon produces many other short-lived nuclides, known as "radon daughters", ending at stable isotopes of lead.[2]
Cornish[kw]
Elven gymyk yw radon, niver 86 y'n Vosen Beriodek. Y furvell gymyk yw Rn. An hanow a dheu dhyworth an elven radiom, ha'y hanow kynsa yn Sowsnek veu radium emanation, awos bos gorrys yn-mes gans radiom. Pur ansad ha peryllus yw radon drefen y radyoweythresans glew. Radon yw an brassa kevriyas dhe dhewynnyans kilva naturel. Ev a dheu dhyworth kerrygi yn naturel, ha rann (pur vyghan) yw y'n ayrgylgh. Ev a guntell yn drehevyansow yn ranndiryow le may ma men growan, kepar ha Kernow. Radon a wra omgemeres rag 10% a gasys kanker skevens. Lemmyn yma daffar previ rag radon. Diskudhys veu gans Ernest Rutherford yn 1899 yn Pennskol McGill, Montreal, Kanada. Ev a studhyas an gass hag a dho dhyworth thoriom, hag aswonn bos elven nowydh ena. Gass diliw yw radon na wra dasoberi gans elvennow erel. Poos atomek radon yw 222, y boynt teudhi yw -71°C ha'y boynt bryjyon yw -62°C. Y dhosedh yw 9.7 gramm an liter