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CH 101 notes 9-21

# CH 101 notes 9-21 - Resonance sharing a bonding pair...

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Resonance sharing a bonding pair between more than two atoms SO 2 ER = 3*8 = 24 e-s VE = 6 + 6 + 6 = 18 e-s 6 e-s / 2 = 3 bonds 12 e-s / 2 = 6 lone pairs S O O - + S O O + - or Section 5.7 S O b O a S O a O b Equivalent Resonance structures Double bond (short, BO = 2) Single bond (long, BO =1, ) Section 5.7 Reality when S-O bond lengths were measured: O S O 2 bonds of medium length BO= # bonds # bonding regions an area of e- density between two atoms = 3 2 = 1.5 Equivalent Resonance Structures S O O - + S O O + - or Section 5.7 Either structure has: 1 S with +1 FC 1 O with –1 FC 1 O with 0 FC Equivalent Resonance structures have the same FC on the same atoms! Average the Bond Order. S O O S O O Resonance Structures interconvertible by simple e- movement Section 5.7 e- pushing arrows start at e- Break bond: arrow starts at bond, ends at atom Make bond: arrow starts at lone pair, ends between atoms Resonance sharing a bonding pair between more than two atoms NO 3 1- VE = 5 + 6 + 6 + 6 +1 = 24 e-s 8 e-s / 2 = 4 bonds ER = 4*8 = 32 e-s 16 e-s / 2 = 8 lone pairs Section 5.7 O a N O c b O + - - O c N O a b O or - - + O b N O a O c or + - - Section 5.7 O a N O c b O O c N O a b O O b N O a O c or or

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CH 101 notes 9-21 - Resonance sharing a bonding pair...

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