Electron pair Beverage cup arrangement in the case of NH3 is a representation of the valence electrons surrounding the N atom. The dot dot structure for ammonia unveils that the N atom connects 1 pair of electrons with each of the three hydrogen atoms, resulting in a total of 3 shared pairs of electrons. The NH3 molecule takes a trigonal pyramidal shape because of the placement of the valence electrons according to its Lewis Beverage cup structure. In the dot symbol depiction of ammonia, the nitrogen atom is enclosed by three spots, each representing a pair of joined electrons with a H atom.

Lewis Structures 2 Water and Ammonia YouTube