: a heavy radioactive gaseous element formed by the decay of radium see Chemical Elements Table
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But a series of major unforeseen problems soon cropped up, including dangerous hydrogen accumulation in piping and ancillary vessels, and inadequate ventilation for managing radon and other gases that are produced as the radioactive waste material breaks down.—IEEE Spectrum, 28 Apr. 2020 And who has the responsibility to get rid of the radon?—Jill Terreri Ramos, New York Times, 26 Apr. 2025 Even so, fixing radon on a large scale can seem like playing a carnival game of whack-a-mole as parts of Idaho continue to see dramatically high levels of the gas.—Nick Rosenberger, Idaho Statesman, 22 Apr. 2025 First, there is no building in the United States without some radon.—Nick Rosenberger, Idaho Statesman, 22 Apr. 2025 See All Example Sentences for radon
: a heavy radioactive gaseous element of the group of inert gases formed by disintegration of radium and used similarly to radium in medicine—symbol Rn
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