CHEM 121 Lecture 4: Exceptions to the Octet Rule
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Chem 121 - lecture 4 - exceptions to the octet rule. Curly arrows: single head arrows for one electron vs. double head arrows for two. Resonance structures: when 2+ electron arrangements can represent a molecule"s bonding. Incomplete octets (h, group 13 -- b, al, ga, in, tl) Only for 3rd row elements and higher. Only expand if you must or if it reduces formal charge. The non-oxygen atom is surrounded by the os. For each negative charge, add one electron to an oxygen. Electrons in lone pairs and bond pairs repel one another.
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