CHEM 31X Lecture Notes - Lecture 3: Lewis Structure, Lone Pair, Molecular Vibration
20 Aug 2016
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Lecture 6: periodic trends and radial distribution functions. Radial distribution: shows probability of finding electron in certain orbital at radius r , equal to wavefunction squared. Nodes: occur with change in sign of wavefunction. Nuclear penetration: whichever orbital has more probability nearest to nucleus penetrates more. 4s has more penetrating ability than 3d this means that it will fill first before 3d: shielding. Different forces involved: nuclear charge (penetrating) and electron shielding. This is why the 4s electron is ejected first: more shielded than 3d electrons. Isomers = same formula but different arrangement: lcao mo method, lcao = linear combinations of atomic orbitals a. i. One of simplest mo theories in which molecular wave function is writtenas lcao: for h atoms, for non-h atoms c. i. In order for 2 orbitals to form mo, must have same symmetry about internuclear axis; otherwise 0 overlap a. i. 1. a. i. 2. Should be combining orbitals with similar energy, otherwise only small interaction: order of filling b. i.
