Electron pair Beverage cup arrangement in the case of NH3 is portrayed by the valence electrons surrounding the N atom. The dot point structure in the case of ammonia reveals that the N atom joins a solitary pair of e- with each of the three hydrogen atoms, resulting in a total of three shared pairs of electrons. The NH3 molecule adopts a trigonal pyramidal structure because of the arrangement of the outer electrons according to its Lewis dot arrangement. In the dot dotpoint representation of NH3, the nitrogen atom is enclosed by three dots, each representing a pair of joined electrons with a hydrogen atom.