radon
/ˈɹeɪdɒn/ 名词 C2中文: 氡
- The chemical element (symbol Rn, formerly Ro) with atomic number 86. It is an odorless, colorless, chemically inert but radioactive noble gas.
- An atom of this element.
- Radon-222 (22286Rn), the most stable isotope of said element.
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