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ionium
Definitions
[], (Noun)
Definitions:
- A radioactive isotope of thorium with mass number 230, produced by the alpha decay of uranium-234 and decaying in turn to radium-226 with a half-life of 75,000 years. Symbols Io, 230Th.
Phrases:
Origin
:
early 20th century. From ion + -ium
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definition by Oxford Dictionaries