最終更新日：2024/07/28

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The chemical element (symbol Rn, formerly Ro) with atomic number 86. It is an odorless, colorless, chemically inert but radioactive noble gas. / The most stable isotope of this element, ²²²₈₆Rn.

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radon

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radon

/ˈɹeɪdɒn/

noun

The chemical element (symbol Rn, formerly Ro) with atomic number 86. It is an odorless, colorless, chemically inert but radioactive noble gas. / The most stable isotope of this element, ²²²₈₆Rn.