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The electron pair arrangement that minimizes repulsion for 3 pairs of electrons is trigonal planar. The angles between electron pairs are 120. The molecular geometry is the arrangement of the central atom and the atoms bonded directly to it. In BF3, all 3 electron pairs around boron are bonding pairs.
This is the âValence Shell Electron Pair Repulsionâ (VSEPR) Theory. Thus, the âElectron Groupâ geometry of each central atom in a structure can be determined by simply counting the number of âgroupsâ of electrons around the atom, then considering how those groups would arrange themselves to be as far apart as possible. â group â of electrons can be a single bond, double bond, triple bond, or a lone pair of electrons. The table below indicates the âMolecular Geometryâ of the central atom depending on whether the groups of electrons around it are covalent bonds to other atoms or simply lone pairs of electrons.