radon

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(İngilizce)

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

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/ˈɹeɪdɒn/

Contraction of radium emanation, since the element appears in the radioactive decay of radium. By surface analysis, radio- + -on (“suffix for noble gases”).