radon
Noun
-
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 (synset 114676283)is a type of:- 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
same as: atomic number 86, rn
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