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110308 - y Draw the Lewis dot structure for CO 2 y Draw the...

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Model for Bonding y A representation of what is happening, but not completely correct y Localized electron model – a molecule is composed of atoms that are bound together by sharing pairs of e - ’s using the atomic orbitals of the bound atoms y Lewis dot structure – method of keeping track of e - ’s in bonding y VSEPR – simple approach to predicting structures and shapes of molecules
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Lewis Dot Structures y Based on wanting to attain noble gas electron configuration y Leads to the octet rule y Types of electrons - core and valence y Dot structures - method of representing the valence electrons
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How to draw Lewis Dot Structures y Step 1: count the number of valence electrons y Step 2: Put central atom and arrange atoms around central atom y Step 3: Distribute electrons around all the atoms except the central atom y Step 4: Count up the number of electrons used and fill the octet on the central atoms by adding lone pairs or multiple bonds
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Lewis Dot Structure Practice
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Unformatted text preview: y Draw the Lewis dot structure for CO 2 y Draw the Lewis dot structure for HNO Lewis Dot Structure Practice y Draw the Lewis dot structure for NO-: y Draw the Lewis dot structure for NO + : Formal Charge y Helps us figure out the best Lewis structure y Electrons should be shared evenly between all the atoms y The structure with the formal charges closest to zero on all atoms will be the most stable Using Formal Charge y Find the correct Lewis dot structure for CNO-: Resonance Effects y In some cases two or more valid and equivalent structures are possible Exceptions to the Octet Rule y H only wants 2 electrons y Li okay with only 2 electrons, but will take more y Be okay with only 4 electrons, but will take more y B okay with only 6 electrons, but will take more y 3 rd and higher row atoms can accept more than 8 electrons because they have the d orbitals available Halogen Molecules Sulfate Ion...
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