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Lewis
Beverage cup structure in the case of ammonia is a representation of the valence electrons surrounding the nitrogen atom.
The Lewis dot arrangement in the case of NH3 unveils that the N atom joins 1 pair of electrons with each of the three hydrogen atoms, resulting in a complete of 3 connected pairs of electrons.
The ammonia molecule takes a trigonal pyramidal form due to the placement of the outer electrons according to its Electron pair Beverage cup structure.
In the dot dotpoint representation of ammonia, the N atom is enclosed by three spots, each representing a pair of connected electrons with a hydrogen atom.