Electron pair Beverage cup structure for NH3 is depicted by the valence electrons surrounding the nitrogen atom. The Lewis dot structure for ammonia exhibits that the N atom unites a solitary pair of electrons with each of the three H atoms, resulting in a total of three united pairs of electrons. The NH3 molecule takes a trigonal pyramidal shape attributed to the distribution of the outer electrons according to its Electron pair dot structure. In the dot dotpoint depiction of ammonia, the nitrogen atom is enclosed by three spots, each representing a pair of united electrons with a H atom.