Electron pair Beverage cup arrangement in the case of NH3 is a representation of the valence electrons surrounding the nitrogen atom. The dot dot structure for NH3 exhibits that the nitrogen atom shares a solitary pair of e- with each of the three H atoms, resulting in a total of a trio shared pairs of electrons. The NH3 molecule takes a trigonal pyramidal shape due to the placement of the valence electrons according to its Lewis Beverage cup arrangement. In the dot symbol representation of ammonia, the nitrogen atom is surrounded by three points, each representing a pair of joined electrons with a hydrogen atom.