ionium

[ ahy-oh-nee-uhm ]
/ aɪˈoʊ ni əm /

noun Chemistry.

a naturally occurring radioactive isotope of thorium. Symbol: Io; atomic number: 90; atomic weight: 230.

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Origin of ionium

First recorded in 1905–10; ion + -ium
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for ionium

  • Ionium expels an alpha particle and becomes radium, which is a bivalent element resembling barium belonging to the second group.

    A Brief Account of Radio-activity|Francis Preston Venable

British Dictionary definitions for ionium

ionium
/ (aɪˈəʊnɪəm) /

noun

obsolete a naturally occurring radioisotope of thorium with a mass number of 230Symbol: Io

Word Origin for ionium

C20: from New Latin, from ion + -ium
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012