It is trigonal pyramidal because of the lone pair of electrons associated with the central nitrogen atom. If the central atom with no lone pair is bonded to three other atoms the molecule will have a trigonal planar shape. This video reviews how to draw Lewis structures for molecules.Planar's commitment to high quality, leading-edge display technology is unparalleled. With innovations in LCD display, video walls, large format displays, and touch interactivity, Planar offers the best visualization solutions for a variety of demanding vertical markets around the globe. Learn more.