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Electron pair dot arrangement in the case of NH3 is a representation of the valence
electrons surrounding the nitrogen atom.
The Lewis dot arrangement for ammonia displays that the
N atom unites a solitary pair of e- with each of the three H atoms, resulting in a complete of a trio shared pairs of electrons.
The NH3 molecule adopts a three-sided pyramid-like structure attributed to the placement of the valence electrons according to its Lewis dot structure.
In the Lewis symbol representation of ammonia, the nitrogen atom is encircled by three points, each representing a pair of united electrons with a H atom.