Electron pair dot arrangement in the case of ammonia is a representation of the outer electrons surrounding the nitrogen atom.
The Lewis dot arrangement for NH3 displays that the N atom unites one pair of e- with each of the three hydrogen atoms, resulting in a overall of a trio shared pairs of electrons.
The ammonia molecule adopts a three-sided pyramid-like shape due to the distribution of the outer electrons according to its Lewis Beverage cup arrangement.
In the dot dotpoint representation of NH3, the N atom is encircled by three spots, each representing a pair of joined electrons with a hydrogen atom.
