Word:

atomic number 86

Noun1.atomic number 86 - 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
argonon, chemical element, element, inert gas, noble gas, radon, Rn
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-- atomic number 86 --
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