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ra·don
 radon
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- pronunciation:
- reI
dan
- features:
- Word Combinations (noun), Word Explorer
| part of speech: |
noun |
| definition: |
a radioactive chemical element of the inert gas group that has eighty-six protons in each nucleus and that is produced by the radioactive decay of trace amounts of radium in the soil. (symbol: Rn)
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