atomic number 86

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Related to atomic number 86: mass number

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Noun

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

radon, Rn

chemical element, element - any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter

argonon, inert gas, noble gas - any of the chemically inert gaseous elements of the helium group in the periodic table

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argonon
inert gas
noble gas
radon
Rn

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