Lewis dot arrangement in the case of NH3 is shown by the valence electrons surrounding the N atom. The dot point arrangement for ammonia unveils that the N atom joins 1 pair of e- with each of the three H atoms, resulting in a total of three joined pairs of electrons. The ammonia molecule takes a three-sided pyramid-like shape attributed to the placement of the outer electrons according to its Lewis dot structure. In the Lewis symbol representation of ammonia, the nitrogen atom is encircled by three dots, each representing a pair of joined electrons with a H atom.