RADON

Radon

Radon is a chemical element with symbol Rn and atomic number 86. It is a radioactive, colorless, odorless, tasteless noble gas, occurring naturally as an indirect decay product of uranium or thorium. Its most stable isotope, 222Rn, has a half-life of 3.8 days. Radon is one of the densest substances that remains a gas under normal conditions. It is also the only gas under normal conditions that only has radioactive isotopes, and is considered a health hazard due to its radioactivity. Intense radioactivity has also hindered chemical studies of radon and only a few compounds are known.

The above text is a snippet from Wikipedia: Radon
and as such is available under the Creative Commons Attribution/Share-Alike License.

radon

Noun

  1. A radioactive chemical element (symbol Rn, formerly Ro) with atomic number 86, one of the noble gases.


The above text is a snippet from Wiktionary: radon
and as such is available under the Creative Commons Attribution/Share-Alike License.

Need help with a clue?
Try your search in the crossword dictionary!