This is an example of a Trigonal pyramidal molecule. It has angles all of which are 107°, and is a 3-dimensional structure. This example is of ammonia. Nitrogen, the central atom, has 5 valence electrons, 3 of which are bonded to hydrogen’s electrons. However, 2 of nitrogen’s valence electrons are not being used for bonding and create a lone pair. Examples: NH3, PCl3.