Meaning of ATOMIC NUMBER 86

WordNet Dictionary
	Definition:		[n]  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
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	Synonyms:		radon, Rn
	See Also:		argonon, chemical element, element, inert gas, noble gas