Many factors, like lone pairs of electrons, size of the overall molecule and of the constituent atoms, multiple bonds, and the molecule's surroundings.
Solved Predicting deviations from ideal bond angles Consider
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Determine the shape, ideal bond angle(s), and the direction of any deviation from these angles for this compound. ClO3
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Section 11-1: Molecular Geometry: Using VSEPR Theory to Determine Three-Dimensional Shapes and Bond Angles
