Chem 115 1nd Edition Lecture 29Outline of Last LectureI. Metallic BondingII. StructuresOutline of Current LectureI. Choosing Most Important StructureII. Exceptions to OctetIII. Valence-Shell Electron-Pair Repulsion TheoryIV. Electron Group Arrangement vs. Molecular ShapeV. Bond AngleVI. Axial and Equatorial PositionCurrent LectureChoosing Most Important Structure- Small formal charges- Same nonzero formal charges on adjacent atoms aren’t preferred- More negative formal charges reside on most electronegative atomExceptions to Octet- hold less than 8o Bo Be- free radical: molecule with odd number of electrons- expanded valence shell is only possible for nonmetals (period 3 or higher)Valence-Shell Electron-Pair Repulsion Theory- each group of valence electrons around central atom is located as far as possibleElectron Group Arrangement vs. Molecular Shape- electron group arrangementbonding and nonbonding- molecular shape3-D arrangement of nuclei joined by bonding groupsThese 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.Bond Angle- angle formed by nuclei of 2 surrounding atoms with nucleus of central atom- lone pairs repel bonding pairs stronger than bonding pairs- double bond has greater electron density and repels single bond electronsAxial and Equatorial Position- Axialup/down from plane- Equatorialleft/right from
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