Definitions
from The Century Dictionary.
- noun In chem., a termination given to the names of compound radicals which are analogous in structure and chemical function to ammonium, NH4, as phosphonium, PH4, or tetramethylphosphonium, P (CH3)4.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun chemistry any
cation derived by theaddition of aproton to thehydride of anyelement of thenitrogen ,chalcogen orhalogen families - noun chemistry any
organic derivative of these compounds - noun physics the bound pair of a
particle and itsantiparticle
Etymologies
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Examples
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The concept of superelectrophiles thus emerged from my previous studies on superacidic carbocation and onium ion systems.
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Examples include onium and carboxonium ions, acyl cations, halonium, azonium, carbozonium ions, even certain substituted carbocations and the like.
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More recently the concept of the "at" - complexes as a counterpart to the "onium" complexes has led to the development of a new chemistry from which have come the sodium tetra phenylborates.
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Related: Swine Flu is the top related story about pandemic-onium being spread via Twitter.
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r & figillum noftrum in noftri confenfus tefti - onium prefentibus iimiliter eft appenfum.
Subsidia diplomatica ad selecta juris Ecclesiastici Germaniae: et historiarum capita elucidanda ... 1777
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