As nouns the difference between onium and ionium
is that onium is (chemistry) any cation derived by the addition of a proton to the hydride of any element of the nitrogen, chalcogen or halogen families or onium can be (physics) the bound pair of a particle and its antiparticle while ionium is (physics|dated) a supposed decomposition-product of actinium once thought to be the source of radium.
onium
English
Noun
(
onium compound)
(
en noun)
(chemistry) any cation derived by the addition of a proton to the hydride of any element of the nitrogen, chalcogen or halogen families
(chemistry) any organic derivative of these compounds
See also
*ammonium
*arsonium
*bismuthonium
*bromonium
*chloronium
*fluoronium
*iodonium
*oxonium
*phosphonium
*selenonium
*stibonium
*sulfonium / sulphonium
*telluronium
Noun
(onium)
(onia)
(physics) the bound pair of a particle and its antiparticle
Derived terms
* -onium, suffix of onia
Related terms
* positronium
* muononium
* tauonium
* toponium
ionium
English
Noun
(-)
(physics, dated) A supposed decomposition-product of actinium once thought to be the source of radium
