CHEM103 Chapter Notes - Chapter 10: Delocalized Electron, Octet Rule, Lone Pair

• School: University of Alberta
• Department: Chemistry
• Course: CHEM103
• Professor: Mariusz Klobukowski

Document Summary

10. 1 depicting molecules and ions with lewis structures. Applying the octet rule to write lewis structures: a group = 5a and column numbers. > molecular formula place atom with lowest en in center. > atom placement add a group numbers. > sum of valence e- draw single bonds and subtract 2e- for each bond. > remaining e- give each atom a full octet. > if central atom doesn"t have an octet, a lone pair from surrounding atom donates it to form a double/triple bond. > need for lewis structure to depict ozone is due to electron pair. > usually in a bond each electron is localized between the bonding atom. > in a resonance two of the electron pairs are delocalize and density delocalization spread over a few adjacent atom: once bonding and one lone pair, esp in organics. > partial bonding in resonance hybrids lead to fractional bond orders. Formal charges; selecting the more important resonance structure.