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Dictionary


i•o•ni•um



Pronunciation: (ī-ō'nē-um), [key]
n. Chem.
a naturally occurring radioactive isotope of thorium. Symbol: Io; at. no.: 90; at. wt.: 230.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

ion implantationionization chamber

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