CHEM 14A Chapter Notes - Chapter 2E.1: Isosurface, Sulfur Hexafluoride, Vsepr Theory
3 Dec 2020
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Document Summary
Molecules have shapes of the geometrical figures shown above. The bond angles are fixed by the symmetry of the molecule. Bond angles of molecules that are not fixed by symmetry must be determined experimentally. Valence-shell electron-pair repulsion model (vsepr model): extends lewis"s theory of bonding by adding rules that account for bond angles and molecular shapes. The most distant locations give the electron arrangement of the molecule. When naming the molecular shape, only the positions of atoms are considered, not any lone pairs that may be present on the central atom. No lone pairs on the central atom. Two bonding pairs lie on opposite sides of the be atom. Rule 2: a multiple bond is treated as a single region of high electron concentration. Two electron pairs in a double bond stay together and repel each other bonds or lone pairs as a unit.
