ionium
/ʌɪˈəʊnɪəm/Chemistry
noun
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.
Origin
Early 20th century. From ion + -ium. With the semantic motivation, compare quot. 1907.
- recuperance
- recuperate
- recuperation
- recuperative
- recuperator
- recuperatorial
- recuperatory
- recur
- recurrable
- recurrence
- recurrence formula
- recurrence rate
- recurrence relation
- recurrence surface
- recurrence time
- recurrent
- recurrent fever
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- recurrent nova
- recurrent polyserositis
- recurrent relation
- Ulfilas
- Ulhasnagar
- Ulithi
- ullage