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Use valence bond theory to explain the bonding in F2, HF, and ClBr. (a) F2: This molecule is symmetrical. The single bond present in this molecule is derived from the overlap of two orbitals contributed by each of the F atoms. (b) HF: This molecule is asymmetrical. The single bond present in this molecule is derived from the overlap of one orbital contributed by the H atom and one orbital contributed by the F atom. (c) ClBr: This molecule is also asymmetrical. The single bond present in this molecule is derived from the overlap of one orbital contributed by the Cl atom and one orbital contributed by the Br atom. Sketch the overlap of the atomic orbitals involved in the bonds.