The single Nitrogen atom in an ammonia molecule is bonded to three atoms of Hydrogen through the sharing of three electron pairs, one with each atom of Hydrogen. In each of these three covalent bonds formed between Nitrogen and Hydrogen, one electron is provided by Nitrogen and one electron is provided by the Hydrogen atom. This forms one pair of shared electrons. The following diagram represents the structure of an ammonia molecule.
As shown in the diagram, the angle between each covalent bond is 107.8 degrees, resulting in a trigonal pyramidal structure.
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