BF3 or boron trifluoride has a trigonal planar molecular geometry. BF3 has a central boron atom and three surrounding fluorine ligands. The three flourine atoms are positioned at the corners of a triangle, all in one three-dimensional plane. All three ligands are identical and have bond angles of 120 degrees.
Each fluorine atom has a valence shell containing seven electrons, while boron has three valence electrons. With a total of 24 valence electrons, all atoms in the BF3 compound are able to achieve full valence shells by covalently bonding. By VESPR theory, BF3 has an AXE notation of AX3. As explained by Chemistry Drills, molecules of an AX3 notation have a trigonal planar geometry.