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Lewis dot arrangement in the case of ammonia is a representation of the
outer electrons surrounding the nitrogen atom.
The Lewis dot structure in the case of ammonia unveils that the N atom joins a solitary pair of electrons with each of the three H atoms, resulting in a complete of three shared pairs of electrons.
The NH3 molecule adopts a trigonal pyramidal form because of the distribution of the outer electrons according to its Electron pair dot arrangement.
In the dot symbol representation of ammonia, the N atom is enclosed by three points, each representing a pair of connected electrons with a hydrogen atom.