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radon

/ˈɹeɪdɒn/ 名词 C2

中文: 氡

  1. The chemical element (symbol Rn, formerly Ro) with atomic number 86. It is an odorless, colorless, chemically inert but radioactive noble gas. (uncountable)
  2. An atom of this element. (countable)
  3. Radon-222 (22286Rn), the most stable isotope of said element. (uncountable)
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