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Related to thoron: radon, thorium


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.
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; 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.
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(nuclear physics)
The conventional name for radon-220. Symbolized Tn.
References in periodicals archive ?
Thoron and Myers (2011) found that the success of a Vee map is not influenced by a student's gender, ethnicity, or grade level.
The idea for the piece actually originated with its director, Rebecca Bayla Taichman, a longtime Thoron collaborator who had done a Yale Drama School research project on the innovative Yiddish theatre's first director, Aleksandr Granovsky.