ionium

ionium

[ahy-oh-nee-uhm]
noun Chemistry.
a naturally occurring radioactive isotope of thorium. Symbol: Io; atomic number: 90; atomic weight: 230.

Origin:
1905–10; ion + -ium

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ionium (aɪˈəʊnɪəm)
 
n
obsolete Io a naturally occurring radioisotope of thorium with a mass number of 230
 
[C20: from New Latin, from ion + -ium]

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