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 NH3 displays that the N atom unites 1 pair of e- with each of the three hydrogen atoms, resulting in a complete of three shared pairs of electrons.
The ammonia molecule adopts a trigonal pyramidal form attributed to the distribution of the outer electrons according to its Electron pair dot structure.
In the dot symbol representation
of ammonia, the N atom is encircled by three points, each representing a
pair of shared electrons with a hydrogen atom.
