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9 Molecular Geometry Solutions to Exercises H CH₄ tetrahedral sp³ no C H H H H BH₃ B-H H trigonal planar no F F trigonal bipyramidal not yes F applicable F F F not F S F octahedral no applicable F F trigonal planar yes C H H F F PF₅ not P F trigonal bipyramidal no applicable F F not XeF₂ F-Xe-F trigonal bipyramidal no applicable 9.52 In order for atomic orbitals to mix or hybridize, they must have the same principal quantum number. In each principal quantum level, there are a maximum of three p orbitals. Any hybrid orbital can have contribution from a maximum of three p orbitals. Hybrid orbitals designated or sp⁵ would require contribution from four or five p orbitals, which is not possible. 9.53 (a) B: [He]2s²2p¹ 1 promote 1 11 hybridize 111 2s 2p 2s 2p sp2 (b) The hybrid orbitals are called sp². 246