noun🔗ShareラドンThe chemical element (symbol Rn, formerly Ro) with atomic number 86. It is an odorless, colorless, chemically inert but radioactive noble gas."Many homes are tested for radon because this invisible, radioactive gas can be harmful to breathe. "この目に見えない放射性ガスを吸い込むと有害であるため、多くの家でラドンの検査が行われています。elementchemistrysubstancescienceChat with AIVocabulary GamePractice Reading
