Electron pair dot arrangement in the case of NH3 is a representation of the outer electrons surrounding the N atom.
The Lewis dot structure in the case of ammonia displays that the N atom joins one pair of e- with each of the three hydrogen atoms, resulting in a total of 3 united pairs of electrons.
The NH3 molecule takes a trigonal pyramidal shape because of the placement of the outer electrons according to its Lewis dot arrangement.
In the Lewis dotpoint depiction of NH3, the N atom is encircled by three dots, each representing a pair of shared electrons with a H atom.
Lewis Structure Study Striver
