Electron pair Beverage cup arrangement in the case of NH3 is depicted by the outer electrons surrounding the N atom. The dot point structure in the case of NH3 displays that the N atom connects a solitary pair of electrons with each of the three hydrogen atoms, resulting in a total of three joined pairs of electrons. The ammonia molecule adopts a trigonal pyramidal form because of the distribution of the valence electrons according to its Electron pair Beverage cup arrangement. In the Lewis dotpoint depiction of ammonia, the nitrogen atom is enveloped by three dots, each representing a pair of connected electrons with a hydrogen atom.

Ammonia NIST Chemistry WebBook