Electron pair Beverage cup structure in the case of ammonia is shown by the valence electrons surrounding the nitrogen atom. The dot dot structure for NH3 unveils that the nitrogen atom joins one pair of electrons with each of the three H atoms, resulting in a total of 3 united pairs of electrons. The NH3 molecule takes a trigonal pyramidal form because of the placement of the valence electrons according to its Lewis dot structure. In the Lewis dotpoint depiction of ammonia, the nitrogen atom is enclosed by three dots, each representing a pair of shared electrons with a H atom.