Lewis Beverage cup arrangement in the case of ammonia is a representation of the valence electrons surrounding the N atom. The dot dot arrangement for NH3 displays that the N atom unites a solitary pair of e- with each of the three hydrogen atoms, resulting in a overall of 3 connected pairs of electrons. The NH3 molecule adopts a three-sided pyramid-like structure attributed to the placement of the valence electrons according to its Lewis dot structure. In the Lewis dotpoint representation of NH3, the N atom is enveloped by three spots, each representing a pair of joined electrons with a H atom.

35 Lewis Structures and Covalent Bonding Chemistry LibreTexts