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11-9-11 - Chemistry 1A F11 11.9.11 Dr Shaka Lewis...

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229 Chemistry 1A F11 11.9.11 Dr. Shaka Course Code 40000 Lewis Structures Fourth, distribute the remaining electrons around the remaining atoms as lone pairs, making sure never to have more than four pair of electrons around any element in the first short period (B, C, N, O, F). Fifth, try to satisfy the octet rule for the elements above, and always satisfy the duet rule for H. If atoms do not satisfy the octet rule, try to make multiple bonds (up to three) to try to achieve an octet.
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230 Chemistry 1A F11 11.9.11 Dr. Shaka Course Code 40000 Lewis Structures Sixth, figure out the formal charge for each atom, and make sure that the formal charges are as small as possible. Finally, consider using resonance structures for situations in which the molecule has symmetry but one Lewis structure alone does not. Always double check to make certain that the total charge is correct! This is simple counting, but on exams I will expect you to be able to count.
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231 Chemistry 1A F11 11.9.11 Dr. Shaka Course Code 40000 Lewis Structures When formulas are quoted in the form AX n you can assume that the n
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