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ionium
ionium (aɪˈəʊnɪəm) n (Elements & Compounds) obsolete a naturally occurring radioisotope of thorium with a mass number of 230. Symbol: Io [C20: from New Latin, from ion + -ium]ionium
ionium[ī′ō·nē·əm] (nuclear physics) A naturally occurring radioisotope, symbol Io, of thorium, atomic weight 230. ionium
i·o·ni·um (ī-ō'nē-ŭm), Former term for thorium-230. [G. iōn, going] ionium (ī-ō′nē-ŭm) [ ion + -ium] Io A natural radioactive isotope of thorium. Ionium is of historical significance only. It was the name given to the element now called thorium (230) . AcronymsSeeIOThesaurusSeethorium |