Structure and Bonding
The lone electron pair on the nitrogen atom (N) in ammonia, represented as a pair of dots, forms the bond with a proton (H+). Thereafter, all four N-H bonds are equivalent, being polar covalent bonds. The ion is isoelectronic with methane and borohydride. In terms of size, the ammonium cation (rionic = 175 pm) resembles the caesium cation (rionic = 183 pm).
Read more about this topic: Ammonium
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