The bonding molecular orbital is lower in energy than the parent orbitals and the antibonding orbital is higher in energy. The total number of molecular orbitals produced by a set of interacting atomic orbitals is always equal to the number of interacting atomic orbitals. Remember antibonding orbitals are higher in energy than bonding orbitals.ĥ Rules for Building and Filling Molecular Orbitals H2 forms σ1s bonding and σ1s* antibonding orbitals Aufbau principle, Pauli Exclusion principle and Hund’s rule all still apply for electron filling. Now to describe bond strength, and magnetism, we need MO Theory.Ĥ Filling and Energy of Molecular Orbitals for H2 In order to explain why molecular shapes in VSEPR make sense, we introduced hybridization theory. Then added VSEPR theory to show what molecules looked like when simple orbital overlap model didn’t work (although sometimes it does not apply i.e. Started with Orbital Overlap Model – described how wavefunctions overlapped and in some cases what molecular structures looked like. We can talk more later about when to do this.ģ Different Models for Describing Different Properties At least half the lecture on Thursday December 1st will be for review but I would like to schedule another review with you. The fall session lectures finish Tuesday November 29th, but we have Lectures on Wednesday, November 30th and Thursday December 1st (1:30 – 2:20 PM) to make up for the holidays (Thanksgiving Day + Remembrance Day). Jules Carlson Class Time: M/W/F 1:30-2:20 Monday, November 7thĢ Housekeeping Final Exam is Monday, December 9th 1 Chapter 7.4 – Molecular Orbital (MO) Theory ContinuedĬHM1111 Section 04 Instructor: Dr.
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