Lewis Dot Rules - LewisDotRules...

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Lewis Dot Rules Rules for drawing Lewis dot structures 1. Count the number of valence e -  each atom brings into the molecule. For ions,  the charge must be taken into account. How many valence electrons in BeCl 2 ? How many valence electrons in NO 2 -  and NO 2 + ? 2. Put electron pairs about each atom such that there are 8 electrons around  each atom (octet rule), with the exception of H, which is only surrounded by 2  electrons. Sometimes it's necessary to form double and triple bonds. Only C, N, O, P  and S (rarely Cl) will form multiple bonds. Draw the Lewis dot structure for CF 4 . The number of valence electrons is 4 + 4 ( 7 ) = 32 electrons. So, we obtain:
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Draw the Lewis dot structure for CO. The number of valence electrons is 4 + 6 = 10 electrons or 5 pairs. Since both C and O  allow multiple bonds we can still follow the octet and write:
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This note was uploaded on 11/22/2011 for the course CHEMISTRY CHM1025 taught by Professor Laurachoudry during the Fall '10 term at Broward College.

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Lewis Dot Rules - LewisDotRules...

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