noun🔗ShareRadonThe 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. "Viele Häuser werden auf Radon getestet, da dieses unsichtbare, radioaktive Gas gesundheitsschädlich sein kann.elementchemistrysubstancescienceChat with AIVocabulary GamePractice Reading
