Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The ammonium cation is a positively charged polyatomic cation with the chemical formula NH+4. It is formed by the protonation of ammonia (NH3). Ammonium (or aminium) is also a general name for positively charged or protonated substituted amines and quaternary ammonium cations (N+R4), where one or more hydrogen atoms are replaced by organic radical groups (indicated by R).

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