Electron pair Beverage cup structure in the case of NH3 is a representation of the valence electrons surrounding the N 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 hydrogen atoms, resulting in a total of three shared pairs of electrons. The NH3 molecule takes a trigonal pyramidal shape due to the placement of the outer electrons according to its Lewis dot arrangement. In the Lewis symbol depiction of ammonia, the nitrogen atom is enveloped by three points, each representing a pair of connected electrons with a H atom.

Lewis Structure for NH3 Ammonia UMD