15 - # of unshared electrons # of bonding electrons S: 6 0...

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15/10/2007 11:27:00 Ionic vs. Covalent Ionic - Transfer from A to B Covalent - Sharing equally Electronegativity EN A aI A - EA A aT A + EA A Lewis Structures Draw skeleton Atoms with fewest bonds o High EN – belong at ‘ends” Often in middle o Carbon requires 4 bonds o Phosphorus requires 3 bonds o S o I (if everything else is a halide) SO 2 Cl 2 EN (S) = 2.5 EN (O) = 3.5 EN (Cl) = 3.0      O Cl  S  Cl          (with 6 electrons on each atom)      O FORMAL CHARGE FC on atom = valance # of electrons in “bare” atom
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Unformatted text preview: # of unshared electrons # of bonding electrons S: 6 0 (8) = 2 Cl: 7 6 (2) = 0 O: 6 6 (2) = -1 (with 6 electrons on each atom) Electron-group geometry BF 3 : planar 3 electron clouds 120 degree angles NF 3 : 4 electron clouds tetrahedral 2 electron clouds O=C=O 180 degree bonding angle 15/10/2007 11:27:00 15/10/2007 11:27:00...
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This note was uploaded on 03/03/2008 for the course CHEM 2090 taught by Professor Zax,d during the Fall '07 term at Cornell University (Engineering School).

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15 - # of unshared electrons # of bonding electrons S: 6 0...

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