Cations

Phosphonium

In chemistry, the phosphonium (more obscurely: phosphinium) cation describes polyatomic cations with the chemical formula PR+4 (where R is a hydrogen or an alkyl, aryl, or halide group). These cations have tetrahedral structures. The salts are generally colorless or take the color of the anions. (Wikipedia).

Phosphonium
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Related pages

Ionic compound | Trigonal bipyramidal molecular geometry | Tetrahedral molecular geometry | Ammonium | Polyatomic ion