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| Positively charged higher-valency (higher-coordination) ions of the nonmetallic elements. More common types are the carbonium, oxonium, sulfonium, nitronium, diazonium, phosphonium, and halonium ions. Classical examples are the methonium ion CH<sub>5</sub><sup>+</sup>, the hydrogenonium ion H<sub>3</sub><sup>+</sup> and and the hydronium ion H<sub>3</sub>O<sup>+</sup>. Onium ions are not limited to monopositive ions, and multiply-charged onium ions exist such as H<sub>4</sub>O<sup>2+</sup> and the distonic oxonium dication H<sub>2</sub>O<sup>+</sup>CH<sub>2</sub>-CH<sub>2</sub>-OH<sub>2</sub>.
| | #REDIRECT [[onium ion]] |
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| == Related Terms ==
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| [[ylium Ion]] | |
