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NCl3 therefore has 3 bonds and 1 lone pair, so 4 things to show in the bond diagram. Making it trigonal pyramidal. However, Boron only has 3 electrons to bond. As these are all used up in the bonds with chlorine, there are only 3 bonding pairs to show in the diagram. Therefore it is trigonal planar.NCl3 has bond angles of 107 degrees whereas BCl3 has bond angles of 120 degrees.nswered by The Community. Making the world better, one answer at a time. Trigonal Pyramidal. It is not trigonal planar because there is one lone pair around the central atom, just like the shape of ammonia.