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zlúčeniny óniové
Subject h. zlúčeniny óniové Subject h. Onium Compounds Scope note in English 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+ 
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