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thoron:

thoron: see radon; thorium.

The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2007, Columbia University Press. All rights reserved.

More on thoron from Infoplease:

thoron: meaning and definitions - thoron: Definition and Pronunciation
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radon - radon radon , gaseous radioactive chemical element; symbol Rn; at. no. 86; mass no. of most stable ...

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