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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
 
 Synonyms: radon, Rn
 
 See Also: argonon, chemical element, element, inert gas, noble gas

 

 

 

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