| 释义 |
thoron
tho·ron T0179200 (thôr′ŏn′)n. A radioactive isotope of radon, Rn-220, having a half-life of 54.5 seconds and produced by the disintegration of thorium.
[thor(ium) + -on.]thoron (ˈθɔːrɒn) n (Chemistry) a radioisotope of radon that is a decay product of thorium. Symbol: Tn or 220Rn; atomic no: 86; half-life: 54.5s[C20: from thorium + -on]thoron
thoron: see radonradon
, 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. ; thoriumthorium
[from Thor], radioactive chemical element; symbol Th; at. no. 90; mass number of most stable isotope 232; m.p. about 1,750°C;; b.p. about 4,790°C;; sp. gr. 11.7 at 20°C;; valence +4.
Thorium is a soft, ductile, lustrous, silver-white, radioactive metal.
..... Click the link for more information. .thoron[′thȯr‚än] (nuclear physics) The conventional name for radon-220. Symbolized Tn. FinancialSeeradonAcronymsSeeTN |