| Io | ionium |
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| ionium | Former term for thorium-230. Origin: G. Ion, going (05 Mar 2000) |
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| ionium |
an isotope of thorium produced in uranium decay, namely 230 Th (half-life = 80 kyr). See table. [Boltwood 1907; Soddy 1, 2, & 3]
Ãâó: web.lemoyne.edu/~giunta/archemg.html
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