Definition of halonium ions

1. *

   Ions of the form R2X+, where X is any halogen (X = Br+, bromonium ions; X = Cl+, chloronium ions; X = F+, fluoronium ions; X = I+, iodonium ions). They may be open-chain or cyclic. GNOC Recom. R-5.8.2. E.g.