Lewis dot arrangement in the case of NH3 is portrayed by the valence electrons surrounding the nitrogen atom.
The Lewis point structure in the case of NH3 exhibits that the nitrogen atom shares 1 pair of e- with each of the three hydrogen atoms, resulting in a overall of
three shared pairs of electrons.
The NH3 molecule takes a trigonal pyramidal structure because of the placement of the valence electrons according to its Electron pair dot arrangement.
In the Lewis symbol representation of NH3, the N atom is surrounded by three points, each representing a pair of joined electrons with a H atom.
