U.S. National Library of Medicine
Ions with the suffix -onium, indicating cations with coordination number 4 of the type RxA+ which are analogous to QUATERNARY AMMONIUM COMPOUNDS (H4N+). Ions include phosphonium R4P+, oxonium R3O+, sulfonium R3S+, chloronium R2Cl+
The numerical value of onium compounds in Chaldean Numerology is: 7
The numerical value of onium compounds in Pythagorean Numerology is: 3
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"onium compounds." Definitions.net. STANDS4 LLC, 2018. Web. 17 Jan. 2018. <http://www.definitions.net/definition/onium compounds>.