CHEM 251 1st Edition Lecture 6 Outline of Last Lecture I. Problem Session Outline of Current Lecture II. Clicker QuestionsIII. Covalent BondingIV. Lewis Dot StructuresV. Molecular OrbitalsCurrent LectureII. Clicker Questions a. Lewis Dot Structure of SbCl5i.b. Which atomic orbitals will form a sigma bond?i.III. Covalent Bondinga. Different bonds have different levels of covalencyb. Polarization predicted by electronegativity considerationsc. Electronegativity follows the same trend as electron affinityIV. Lewis Dot Structuresa. Ensure an octet (if at all possible).b. Do not exceed an octet unless d-orbitals are available.c. Minimize overall charge.d. Avoid adjacent charges (zwitterions).e. Look for lone pairs adjacent to incomplete octets – and make a bond!f. Resonance structuresi. Use double-headed arrowsV. Molecular OrbitalsThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.a. Graphical representationi.b. Energy level representationi.c. 2 atomic orbitals produce 2 molecular orbitalsd. Same rules as atomic orbitalse. Bond order = total # of bonding orbitals – total # of anti-bonding orbitalsf. Example: H2i.g. Bonding in n = 2 moleculesi. Determine highest energy partially filled orbitalsh.
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