Lewis dot arrangement in the case of NH3 is illustrated by the outer electrons surrounding the nitrogen atom.
The dot point arrangement for NH3 displays that the N atom joins 1 pair of e- with each of the three hydrogen atoms, resulting in a overall of 3 united pairs of electrons.
The ammonia molecule takes a trigonal pyramidal structure attributed to the placement of the outer electrons according to its Electron pair dot structure.
In the dot dotpoint depiction of NH3, the nitrogen atom is encircled by three dots, each representing a pair of joined electrons with a H atom.
