Lewis dot arrangement in the case of NH3
is shown by the outer electrons surrounding the N atom.
The dot dot structure for NH3 reveals that the nitrogen atom connects 1 pair of e- with each of the three hydrogen atoms, resulting in a overall of 3 connected pairs of electrons.
The NH3 molecule adopts
a three-sided pyramid-like shape because of the placement of the outer electrons according to its Electron pair dot arrangement.
In the Lewis symbol depiction of NH3, the N atom is surrounded by three spots, each representing a pair of shared electrons with a hydrogen atom.
