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Electron pair dot arrangement for NH3 is a representation of the valence electrons surrounding the nitrogen atom.
The dot dot arrangement in
the case of NH3 exhibits that the N atom shares 1 pair of electrons with each of the three hydrogen atoms, resulting in a overall of three shared pairs of electrons.
The ammonia molecule takes a trigonal pyramidal structure because of the placement of the valence electrons according to its Lewis Beverage cup structure.
In the Lewis dotpoint representation of NH3, the N atom is encircled by three spots, each representing a pair of joined electrons with a H atom.