Lewis dot arrangement in the case of ammonia is illustrated by the outer electrons surrounding the nitrogen atom. The dot point structure in the case of NH3 reveals that the nitrogen atom joins one pair of electrons with each of the three hydrogen atoms, resulting in a total of 3 joined pairs of electrons. The ammonia molecule adopts a trigonal pyramidal structure due to the distribution of the valence electrons according to its Lewis dot structure. In the Lewis dotpoint representation of ammonia, the nitrogen atom is enveloped by three dots, each representing a pair of united electrons with a hydrogen atom.