CHEM101 Lecture Notes - Lecture 16: Molecular Geometry, Electronegativity, Octet Rule

• School: University of Alberta
• Department: Chemistry
• Course: CHEM101
• Professor: Rylan Lundgren

Document Summary

Never have more than 8 valence electrons for 1st row elements: below the 1st row it"s okay to break the octet rule. Ch3oh results in 2 central atoms but the same rules apply for the vespr structure, it is linear with 2pis. Bond polarity and dipole moment: require polarized bonds, electronegativity difference between bonded atoms, overall dipole (i. e. the dipoles from single bonds don"t cancel out, h2o. Add up the individual dipoles to determine if there is an overall dipole. Dipole moments start at the delta+ and point towards the delta-. In h2o the overall dipole points straight up. In bf3 the dipoles bring you back to where you started and there is no overall dipole moment. No net molecular dipole: delta positive vs delta negative. The more electronegative element in the bond is the delta negative one. Hydrogen is about the same as carbon: boiling point.