QS Study

Formation of Ammonia ion (NH4)

In ammonia, there are three single N-H bonds and a lone pair on the nitrogen atom. When it reacts with H+ ion, the lone pair is used to form a coordinate bond between the nitrogen atom and hydrogen ion. Thus ammonium ion is formed.

The electrons of nitrogen have been denoted by dot and those of hydrogen atoms by the cross. So by definition, there are three covalent N-H bonds and one N → H coordinate bond in NH4+ ion.

Bond in NH4+ ion