Many factors, like lone pairs of electrons, size of the overall molecule and of the constituent atoms, multiple bonds, and the molecule's surroundings.
Predicting deviations from ideal bond angles - 10/7/2014 ALEKS Alex H. Yuan - 10/07/2014 7:41:27 PM EDT - Copyright 2014 UC Regents and ALEKS
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9.2f Predicting deviations from ideal bond angles
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