Meaning of ATOMIC NUMBER 86
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WordNet Dictionary |
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| 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 |
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| See Also: | | argonon, chemical element, element, inert gas, noble gas | |
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