Electron pair dot arrangement
in the case of NH3 is a representation of the outer electrons surrounding the nitrogen atom.
The Lewis point structure for ammonia displays that the nitrogen atom unites 1 pair of e- with each of the three H atoms, resulting in a total of 3 connected pairs of electrons.
The ammonia molecule takes a three-sided pyramid-like structure due to the placement of the outer electrons according to its Lewis dot arrangement.
In the Lewis dotpoint representation of ammonia, the N atom is enveloped by three points, each representing a pair of shared electrons with a H atom.
