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Lewis Beverage cup arrangement in the case of ammonia is a representation of the valence electrons surrounding the nitrogen atom.
The dot point structure for ammonia displays that the nitrogen atom shares one pair of e- with each of the three hydrogen atoms, resulting in a complete of three joined pairs of electrons.
The ammonia molecule adopts a trigonal pyramidal form attributed to the arrangement of the valence electrons according to its Lewis dot arrangement.
In the dot dotpoint depiction of ammonia, the nitrogen atom is enclosed by three spots, each representing a pair of united electrons with a hydrogen atom.