/ˈɹeɪdɒn/
OriginContraction of radium emanation, since the element appears in the radioactive decay of radium. By surface analysis, radio- + -on (“suffix for noble gases”).
- uncountableThe chemical element (symbol Rn, formerly Ro) with atomic number 86. It is an odorless, colorless, chemically inert but radioactive noble gas.
- uncountableRadon-222 (²²²₈₆Rn), the most stable isotope of said element.
- A surname from German.
- Johann Radon (1887-1956), an Austrian mathematician with results in measure theory, functional analysis and geometry.