This is an example of a trigonal planar molecule that contains no lone pairs. This is a boron fluoride molecule, BF3, which has 24 valence electrons to use for the lewis dot structure. When the lewis dot structure is drawn there are three bonding locations and no lone pairs on the central atom. This type of configuration would give you a trigonal planar geometry. This geometry has only one angle between the atoms which is 120 degrees. Try it with these other linear molecules: Aluminum chloride (AlCl3) and Boron chloride (BCl3).