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Lewis Diagrams

# Lewis Diagrams - Polarity and Geometry of Bonds A Lewis...

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Polarity and Geometry of Bonds A) Lewis Diagrams Steps for writing electron-dot structures 1. Determine the total valance e’. Each (-) negative charge add 1 Each (+) positive charge subtract 1 2. Determine the central atom (least electronegative). Place other atoms around it. 3. Place a single bond (2 e’) between all atoms. 4. Subtract the bonding e’ from total. 5. Full fill octects of all atoms with remaining e’. Recount to make sure. 6. Hints: a) H is always terminal. b) Assume the corresponding number of bonds for each group. c) C makes 4 bonds. d) Are exceptions: 1. Free radicals. Ex NO, NO 2 , ClO 2 , unpaired e' ,Cl . 2. Too few e'. a. Boron can have 6e'. BF 3 b. Be has 4e' Ex BeF 2 . c. Too many e', P= 10e', S = 12e', EX. PCl 5 , SF 6

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Can have multiple bonds Ex. 1 O + H H O H H C + Cl C l C l C l C C l C l C l C l SO 3 S 1. 2. 4 x 6 = 24 3. S O O O 24 - 6 = 18 4. 5. S O O O
PBr 3 Br P Br Br P 1 x 5 = 5 Br 3 x 7 = 21 26 e' Ex. 3 For Charged species add an e’ or take one away from total. NO

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Lewis Diagrams - Polarity and Geometry of Bonds A Lewis...

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