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Lewis dot arrangement for ammonia is shown by the outer electrons surrounding the N atom.
The dot point structure in the case of NH3 reveals that the nitrogen atom connects 1 pair of e- with each of the three H atoms, resulting in a overall of 3 united pairs of electrons.
The NH3 molecule adopts a trigonal pyramidal structure due to the placement of the outer electrons according to its Electron pair dot arrangement.
In the dot dotpoint depiction of ammonia, the nitrogen atom is surrounded by three spots, each representing a pair of joined electrons with a H atom.
NH3 Lewis Structure Geometry and Hybridization