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Lewis structures2 - 1 count electrons 2 draw bond framework...

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1. count electrons 2. draw bond framework 3. a.add remaining electrons in pairs to outer atoms until a noble gas configuration is achieved. b. add remainder to central atom c. form multiple bonds to satisfy the noble gas configuration of the inner atom as needed. 4. Check for exceptions to the octet rule. 5. minimize formal charges Detailed description, with PO 4 3- as an example. 1. take all the valence electrons from the molecule (example: carbon has 4) and add them together. If your molecule is charged (like PO 4 3- ) be sure to add or subtract those electrons too. P=5e- O=6e- charge=3e- Total= (5+6x4+3)=32 e- 2. generally, the first atom listed in the name of a compound should be the central atom, so if you don’t know where to start choose that one. A huge exception to this is when H is the first atom listed. H is too small and can only form 1 bond so it can’t be in the center. Choose the second atom in this case. For us, P is going to be in the middle, with the 4 oxygen on the outside.
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