Electron pair Beverage cup arrangement for NH3 is a representation of the outer electrons surrounding the nitrogen atom. The dot point arrangement for ammonia exhibits that the nitrogen atom joins 1 pair of e- with each of the three hydrogen atoms, resulting in a complete of 3 joined pairs of electrons. The ammonia molecule takes a trigonal pyramidal shape because of the distribution of the valence electrons according to its Electron pair Beverage cup arrangement. In the Lewis dotpoint representation of NH3, the nitrogen atom is enveloped by three points, each representing a pair of shared electrons with a H atom.