Electron pair Beverage cup arrangement in the case of NH3 is shown by the outer electrons surrounding the N atom. The Lewis point arrangement in the case of NH3 unveils that the nitrogen atom joins one pair of electrons with each of the three hydrogen atoms, resulting in a total of three connected pairs of electrons. The ammonia molecule adopts a trigonal pyramidal form due to the distribution of the outer electrons according to its Lewis Beverage cup arrangement. In the dot symbol depiction of ammonia, the nitrogen atom is enveloped by three spots, each representing a pair of connected electrons with a hydrogen atom.

Ammonia NIST Chemistry WebBook