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Thus, the compound of ammonia is in a trigonal pyramidal shape or in a tetrahedral sphere because as atoms form bonds at 107.8 degrees, 4 pairs of electrons formed by the 5 valence electrons of nitrogen and the 3 electrons of hydrogen are distributed equally around the molecule.his chemical compound is basically formed from the basic elements of nitrogen and hydrogen, in the absence of water. As early as the 8th century, salts of ammonia have already use by Muslim alchemists and, during the 13th century, this substance was use by European alchemists to alter colors of vegetable dyes.
In each of those molecules or ions, the central atom and the four outer atoms are all in the same plane, with bond angles of 120Âº between the outer atoms. If a molecule has three outer atoms and ONE lone pair of electrons on the central atom, it is trigonal pyramidal.Some examples are NH3 (ammonia), ClO3^-1 (the chlorate ion), H3O^+1 (the hydronium ion), and PCl3 (phosphorus trichloride).est Answer: You can tell the difference by examining the Lewis structure. If a molecule has three outer atoms and NO lone pairs of electrons on the central atom, it is trigonal planar. Some examples are SO3 (sulfur trioxide), CO3^-2 (the carbonate ion), NO3^-1 (the nitrate ion), and BF3 (boron trifluoride).