Electron pair Beverage cup arrangement in the case of ammonia is depicted by the valence electrons surrounding the nitrogen atom. The Lewis point arrangement for ammonia unveils that the N atom joins one pair of e- with each of the three hydrogen atoms, resulting in a total of three united pairs of electrons. The ammonia molecule adopts a trigonal pyramidal shape due to the placement of the valence electrons according to its Lewis Beverage cup structure. In the dot dotpoint depiction of NH3, the nitrogen atom is surrounded by three points, each representing a pair of joined electrons with a H atom.