Electron pair Beverage cup arrangement for NH3 is shown by the valence electrons surrounding the N atom. The dot dot arrangement for NH3 reveals that the N atom connects 1 pair of e- with each of the three hydrogen atoms, resulting in a total of 3 united pairs of electrons. The ammonia molecule takes a trigonal pyramidal structure due to the distribution of the outer electrons according to its Lewis Beverage cup arrangement. In the Lewis symbol representation of NH3, the N atom is encircled by three spots, each representing a pair of connected electrons with a H atom.