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Rn, symbol for the element radon radon , gaseous radioactive chemical element; symbol Rn; at. no. 86; mass no. of most stable isotope 222; m.p. about −71°C;; b.p. −61.8°C;; density 9.73 grams per liter at STP; valence usually 0. Radon is colorless and the most dense gas known.
..... Click the link for more information. . rn (ReadNews) A newsreader for Usenet newsgroups. An enhanced version of rn that includes threads is trn. See Usenet.Rn (chemistry) Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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