CHE 2AH Lecture Notes - Lecture 6: Lone Pair, Octet Rule, Unpaired Electron

• School: UC-Davis
• Department: Chemistry
• Course: CHE 2AH
• Professor: staff

Document Summary

Content category 5b: nature of molecules and intermolecular interactions. Covalent bond (gc: lewis electron dot formulas, formulas are drawn in such a way that an octet is achieved on each atom. Exceptions include boron column (form 3 bonds and have a six-tet), large elements (3rd row and below such as the 10-tet p in po4 with an odd # total electrons that result in a single, unpaired electron) They don"t have lone pairs on the central atom. e. g. bf3: lewis base donate electron pairs. The symmetry cancels out their individual dipole moments: things with a dipole moment are said to be polar, and bonds, hybrid orbitals: sp3, sp2, sp and respective geometries, hybrid orbitals: combination of sigma and pi orbitals. Equal energy levels: sigma bonds formed in overlap of hybrid orbitals, pi bonds formed in overlap of p orbitals, determining hybrid orbitals formed by an atom: count number of sigma bonds and lone pairs.