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Lewis dot arrangement in the case of NH3 is portrayed by the valence electrons surrounding the N atom. The Lewis point arrangement for ammonia exhibits that the N atom unites 1 pair of electrons with each of the three H atoms, resulting in a total of a trio united pairs of electrons. The ammonia molecule takes a trigonal pyramidal structure due to the distribution of the valence electrons according to its Lewis Beverage cup arrangement. In the Lewis dotpoint representation of NH3, the nitrogen atom is encircled by three dots, each representing a pair of shared electrons with a H atom.