CHEM 1061 Chapter Notes - Chapter 10: Octet Rule, Vsepr Theory, Molecular Geometry
Document Summary
Determine relative placement of atoms in the molecule, then distribute the total number of valence electrons as bonding and lone pairs. Each atom fills its outermost energy level with eight electrons (2 for hydrogen) Have the same relative placement of atoms but different locations of bonding and lone electron pairs. Actual molecule is a resonance hybrid, average of the structures. In a single, double, triple bond each electron pair is localized between the bonded atoms. In resonance hybrids, two of the electron pairs (bonded and a lone) are delocalized. Charge atom would have if the bonding electrons were shared equally. Number of valence electrons - shared and unshared valence electrons. Each electron in a lone pair counts as 1 (2 total) Smaller formal charges (positive or negative) are preferable to larger ones. The same nonzero formal charges on adjacent atoms is not prefered. A more negative formal charge should reside on a more electronegative atom.
