Ionium
[ahy-oh-nee-uh m] /aɪˈoʊ ni əm/
noun, Chemistry.
1.
a naturally occurring radioactive isotope of thorium. Symbol: Io; atomic number: 90; atomic weight: 230.
/aɪˈəʊnɪəm/
noun
1.
(obsolete) a naturally occurring radioisotope of thorium with a mass number of 230 Io
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