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Lewis Beverage cup arrangement in the case of NH3 is illustrated by the outer electrons surrounding the N atom.
The dot dot structure for NH3 displays that the N atom joins 1 pair of electrons with each of the three hydrogen atoms, resulting in a overall of three joined pairs of
electrons.
The NH3 molecule takes a trigonal pyramidal shape due to the arrangement of the valence electrons according to its Electron pair Beverage cup arrangement.
In the Lewis symbol depiction of ammonia, the N atom is enclosed by three dots, each representing a pair of joined electrons with a H atom.