CHEM 1211 Lecture 18Outline of Last Lecture I. Using a Clicker for SpinsA. Clicker Question OneB. Clicker Question TwoC. Clicker Question ThreeD. Clicker Question FourII. Electron Configurations for HeliumIII. Hund’s RuleOutline of Current Lecture I. Ionic BondsA. Lewis Dot Structures 1. RbBr2. Xw3. Al2S3B. Ionic Bond Covalent BondII. Covalent Compounds 1. CCl42. CHBrCHBrCurrent Lecture: I. Ionic BondsA. Lewis Dot Structures: electro-static attraction because of oppositely charged ions1. RbBr# of valence electrons: 1 7Rb Br Rb+ Br -2. XeXe OCTET3. Al2S3- We know that aluminum has three valence electrons because it’s in group three.B. Ionic Bond Covalent BondDE Broglie:- Electrons can be 3-D waves - Atomic orbitals molecular orbitals- Can have the same amplitude** Sigma bond (covalent) is formed by two hydrogen bonded atoms with an amplitude of five N= 1, l= S, ml = 0- Look at the potential energy diagram in your textbookII. Covalent Compounds 1. CCl4Carbon is the central atomC - 4 x 1: 4Cl4 - 7 x 4: 28CCl4 = 32 valence electrons totalTetrahedral compound2. CHBrCHBr: total valence e- : 24*** DO FOR HOMEWORK!!# Electron pairs electron pair geometry2 linear3 trigonal planar4 tetrahedral5 trigonal bipyrimidal6
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