Lewis Beverage cup structure in the case of NH3 is shown by the outer electrons surrounding the N atom. The dot point arrangement for ammonia displays that the nitrogen atom shares one pair of e- with each of the three hydrogen atoms, resulting in a overall of three shared pairs of electrons. The NH3 molecule adopts a trigonal pyramidal structure because of the placement of the outer electrons according to its Lewis dot arrangement. In the dot symbol depiction of ammonia, the N atom is encircled by three points, each representing a pair of joined electrons with a H atom.