CHEM 1211 Lecture 18 Outline of Last Lecture I Using a Clicker for Spins A Clicker Question One B Clicker Question Two C Clicker Question Three D Clicker Question Four II Electron Configurations for Helium III Hund s Rule Outline of Current Lecture I Ionic Bonds A Lewis Dot Structures 1 RbBr 2 Xw 3 Al2S3 B Ionic Bond Covalent Bond II Covalent Compounds 1 CCl4 2 CHBrCHBr Current Lecture I Ionic Bonds A Lewis Dot Structures electro static attraction because of oppositely charged ions 1 RbBr of valence electrons 1 Rb 2 Xe Xe 3 Al2S3 OCTET 7 Br Rb Br We know that aluminum has three valence electrons because it s in group three B Ionic Bond Covalent Bond DE 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 textbook II Covalent Compounds 1 CCl4 Carbon is the central atom C 4 x 1 4 Cl4 7 x 4 28 CCl4 32 valence electrons total Tetrahedral compound 2 CHBrCHBr total valence e 24 DO FOR HOMEWORK Electron pairs electron pair geometry 2 linear 3 trigonal planar 4 tetrahedral 5 trigonal bipyrimidal 6 octahedral
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