01:160:161 Lecture 7: Chapter 7 Atoms First
9 Apr 2016
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Document Summary
Lewis structures do not tell what the shapes of the molecules are. The shapes are important to know because some of the physical and the chemical properties of the molecules depend on their shapes. Bond length (the distance between two atoms) Bond angles (angle between bonds around an atom in the molecule) Experimentally, these parameters can be determined by x-ray diffraction method. The simplest method to predict the molecular structure is to use the valence shell electron pair repulsion (vsepr) model. Molecular geometry or the shape of the molecule takes into account the direction of the bonding electron pairs between the nuclei and the bond angles generated between the bonding electron pairs in the molecule. Molecular geometry takes into account only bonding pairs. Electron domain geometry takes into account both bonding and non-bonding pairs. The model works well also with molecules with multiple bonds.
