L07 Chem 111A Lecture Notes - Lecture 10: Electrostatics, Valence Electron, Junkers J 1
28 Dec 2015
School
Department
Course
Professor
Document Summary
H atom has a single proton and a single electron. There is a coulombic attraction between the proton and electron and thus is the only interaction to consider. The bohr equation allows us to solve for e_tot exactly for 1 electron systems. Unfortunately, the schrodinger equation can only be solved exactly for the 1 electron case. We can only simulate orbitals and approximate energies for multi electron atoms/ions. Orbital energies are greatly affected by inter electron interactions. Shielding/screening: orbitals for multi electrons (heavy) atoms/ions are hydrogen like, but they are comparatively contracted depending on the degree of exposure to the positive charges in the nucleus. The 1s orbital is closer to a larger nucleus than for a smaller nucleus. Ex: the 1s orbital of lithium is closer than the 1s orbital of hydrogen. There are also coulombic repulsions between electrons because they are the same charge.
