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Radon (Rbcefkr)

Definition
A radioactive gaseous element formed by the disintegration of radium; the heaviest of the inert gasses; occurs naturally (especially in areas over granite) and is considered a hazard to health. (Source: wordnet.princeton.edu)
Broader Term
Group 0 elements (Rbcefk)
Related Terms (Hierarchical)
Helium (Rbcefkh)
Xenon (Rbcefkx)