Electron pair dot arrangement in the case of NH3 is depicted by the outer electrons surrounding the N atom. The Lewis dot arrangement for ammonia exhibits that the nitrogen atom connects one pair of electrons with each of the three H atoms, resulting in a overall of a trio joined pairs of electrons. The NH3 molecule takes a trigonal pyramidal structure due to the arrangement of the valence electrons according to its Lewis dot arrangement. In the dot symbol depiction of ammonia, the nitrogen atom is enclosed by three dots, each representing a pair of united electrons with a H atom.