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15 - • of unshared electrons –½ of bonding electrons...

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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 –½ # of bonding electrons ← S: 6 – 0 – ½ (8) = 2 ← Cl: 7 – 6 – ½ (2) = 0 ← O: 6 – 6 – ½ (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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15 - • of unshared electrons –½ of bonding electrons...

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