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radon
(Encyclopedia)radon rāˈdŏn [key], gaseous radioactive chemical element; symbol Rn; at. no. 86; mass no. of most stable isotope 222; m.p. about −71℃; b.p. −61.8℃; density 9.73 grams per liter at STP; vale...emanation, in chemistry
(Encyclopedia)emanation: see radon.niton
(Encyclopedia)niton: see radon.radium emanation
(Encyclopedia)radium emanation: see radon.Rn
(Encyclopedia)Rn, symbol for the element radon.thoron
(Encyclopedia)thoron: see radon; thorium. ...actinon
(Encyclopedia)actinon ăkˈtənŏnˌ [key]: see radon. ...Periodic Table of the Elements: Radon
(Encyclopedia)Periodic Table of the Elements: Radon ...inert gas
(Encyclopedia)inert gas or noble gas, any of the elements in Group 18 of the periodic table. In order of increasing atomic number they are: helium, neon, argon, krypton, xenon, and radon. They are colorless, odorle...oganesson
(Encyclopedia)oganesson ōˈgənĕsˌən [key], artificially produced radioactive chemical element; symbol Og; at. no. 118; mass number of most stable isotope 294; m.p., b.p., sp. gr., and valence unknown. Situated...Browse by Subject
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