CHEM 1211 Lecture 19 Outline of Last Lecture I Ionic Bonds A Lewis Dot Structures 1 RbBr 2 Xw 3 Al2S3 B Ionic Bond Covalent Bond II Covalent Compounds 1 CCl4 I CHBrCHBr Outline of Current Lecture I Covalent bonds II CH3NH2 Current Lecture I Covalent bonds A C2H2Br2 1 How many valence electrons 24 2 How many valence electrons are needed to complete the outer shell 36 3 How many electrons are shared in bonds N A 12 4 How many lone pairs A S 12 Geometry Isomers different chemical and physical properties Best Value of electro negativity halogens greater pull of electrons NO NET DIPOLE Two polar covalent bonds with dipoles in opposite direction H H C C Br Vector magnitude and direction Polar bond Br II Just because a molecule has polar covalent bonds doesn t mean the molecule itself is polar Mainly between non metals CH3NH2 1 How many valence electrons 14 2 How many valence electrons needed to complete the outer shell 26 3 Electrons shared in bonds N A 12 4 Lone Pairs A S 2
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