Lewis Beverage cup structure in the case of NH3 is depicted by the outer electrons surrounding the nitrogen atom. The dot point arrangement in the case of ammonia displays that the N atom joins one pair of e- with each of the three H atoms, resulting in a complete of three united pairs of electrons. The NH3 molecule takes a three-sided pyramid-like form attributed to the placement of the outer electrons according to its Electron pair Beverage cup arrangement. In the Lewis dotpoint representation of ammonia, the nitrogen atom is enclosed by three dots, each representing a pair of united electrons with a hydrogen atom.

Lewis Theory of Bonding Chemistry LibreTexts