CHEM 1211 Lecture 20 Outline of Last Lecture I Covalent bonds II CH3NH2 Outline of Current Lecture I Covalent Bonds A N2 B CO32II Octet Rule Violators A BCl3 B I3 Current Lecture I Covalent Bonds A N2 1 How many valence electrons are present 10 2 How many valence electrons are needed for the outer shell 16 3 How many electrons are shared bonds N A 16 10 6 4 How many lone pairs are present A S 10 6 4 5 What is the electron pair geometry Linear 6 What is the molecular geometry Linear N N Bond Order 3 Number of electrons bonded between two atoms divided by the number of bonding electrons total In this case 6 3 3 The closer two things are together the greater the bond B CO321 How many valence electrons are present 24 2 How many valence electrons are needed for the outer shell 32 3 How many electrons are shared bonds N A 32 24 8 4 How many lone pairs are present A S 24 8 16 5 What is the electron pair geometry Trigonal Planar 6 What is the molecular geometry Trigonal Planar 7 Average bonding order 1 33 1 1 1 O C O or O C O or 1 O O All structures put together residence hybrid O C O O Formal Charge NVE LPE BE II Octet Rule Violators A BCl3 1 How many valence electrons are present 24 B very reactive searching for electrons for p orbital 2 Electron Pair geometry Trigonal Planar 3 Molecular Geometry Trigonal Planar Cl Cl B Cl Polar Bonds Cl is more electro negative than Boron No Net Dipole B I3Valence Electrons 22 Electron Pair Geometry Trigonal Bipyrimidal Molecular Geometry Linear I I I 1 O C O O 1
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