Electron pair Beverage cup arrangement in the case of ammonia is illustrated by the valence electrons surrounding the nitrogen atom. The Lewis dot structure for ammonia reveals that the N atom joins one pair of e- with each of the three H atoms, resulting in a overall of three joined pairs of electrons. The NH3 molecule takes a three-sided pyramid-like form attributed to the distribution of the valence electrons according to its Lewis Beverage cup arrangement. In the dot symbol representation of ammonia, the nitrogen atom is enveloped by three spots, each representing a pair of shared electrons with a H atom.