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