Electron pair Beverage cup structure in the case of NH3 is shown by the valence electrons surrounding the nitrogen atom. The Lewis dot structure for ammonia exhibits that the N atom joins one pair of electrons with each of the three H atoms, resulting in a total of a trio connected pairs of electrons. The NH3 molecule takes a trigonal pyramidal shape attributed to the distribution of the valence electrons according to its Lewis dot arrangement. In the dot dotpoint representation of ammonia, the nitrogen atom is enclosed by three spots, each representing a pair of joined electrons with a H atom.