symbol-Rn; atomic number-86; a heavy radioactive gaseous element of the group of inert gases formed by disintegration of radium and used similarly to radium in medicine
Radon is a chemical element with the symbol Rn and atomic number 86.
Radon is a chemical element with the symbol Rn and atomic number 86.
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Tthe radon level in the basement was impermissibly high.
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2 syllables
ra-don
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