radon

/ˈɹeɪdɒn/

IPA: /R EY1 D AA0 N/

noun
  1. 1

    The chemical element (symbol Rn, formerly Ro) with atomic number 86. It is an odorless, colorless, chemically inert but radioactive noble gas.

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Source: https://en.wiktionary.org/wiki/radon

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