CHM 1046 Lecture Notes - Lecture 1: Intermolecular Force, Phosphorus Trichloride, London Dispersion Force
Document Summary
The ability of atoms in a molecule to attract electrons to itself. Fluorine is the most electronegative element (usually top right is highest) Noble gases are not assigned an electronegativity. The electrons are shared equally (electronegativity different 0-0. 4) One of the atoms exerts a greater attraction for bonding (. 5 to 1. 9) Lewis structures: find total electrons (pcl3) 5 for p + 3(7) for cl = 26, least electronegative atom as center, make single bonds to everything else, fill outer atom octets, fill centers atoms octet. Molecule dipole moment (polarity) depends on both the polarities of the individual bonds and geometry of the molecule. Are not nearly as strong as intramolecular attractions. Are strong enough to control physical properties such as boiling and melting points, vapor pressures, and viscosities. Imf group are refereed to as van der waals forces. Forms instantaneous dipole when electrons are on same side of atom.
