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Lewis dot arrangement in the case of NH3 is illustrated by the
outer electrons surrounding the nitrogen atom.
The dot point structure in the case of NH3 reveals that the nitrogen atom joins one pair of e- with each of the three H atoms, resulting in a total of 3 connected pairs of electrons.
The ammonia molecule takes a trigonal pyramidal form attributed to the placement of the outer electrons according to its Electron pair Beverage cup
structure.
In the dot symbol representation of ammonia, the N atom is enveloped by three spots, each representing a pair of joined electrons with a H atom.