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ionium
[ ahy-oh-nee-uhm ]
noun
, Chemistry.
- a naturally occurring radioactive isotope of thorium. : Io; : 90; : 230.
ionium
/ aɪˈəʊnɪəm /
noun
- obsolete.a naturally occurring radioisotope of thorium with a mass number of 230 Io
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Word History and Origins
Origin of ionium1
C20: from New Latin, from ion + -ium
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Example Sentences
Ionium expels an alpha particle and becomes radium, which is a bivalent element resembling barium belonging to the second group.
From Project Gutenberg
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