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Chapter+3 - Chapter 3 Simple Bonding Theory Lei Li Click to...

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Click to edit Master subtitle style 2/17/10 Chapter 3 Simple Bonding Theory Lei Li [email protected] 317-278-2202
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2/17/10 3-1 Lewis Electron-Dot
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2/17/10 Octet rule “The octet rule is a simple chemical rule of thumb that states that atoms tend to combine in such a way that they each have eight electrons in their valence shells, giving them the same electronic configuration as a noble gas. The rule is applicable to the main- group elements, especially carbon, nitrogen, oxygen, and the halogens. In simple terms, molecules or ions tend to be most stable when the outermost electron shells of their constituent atoms contain eight electrons.” ----- Definition by Wikipedia 2 s 2 p
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2/17/10 How to draw Lewis Electron-Dot Diagrams C: [He] 2 s 2 2 p 2 O: [He] 2 s 2 2 p 4 Step 1: Determine the total number of valence electrons. Step 2: Write the skeleton structure of the molecule. Step 3: Use two valence electrons to form each bond in the skeleton structure. Step 4: Try to satisfy the octets of the atoms by distributing the remaining valence electrons as nonbonding electrons.
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2/17/10 3-1 resonance CO 32- CO32-, NO3-, SO3 are isoelectronic , therefore, their Lewis diagrams are identical
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