ionium


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i·o·ni·um

(ī-ō'nē-ŭm),
Former term for thorium-230.
[G. iōn, going]
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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) .
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