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2 - 3D Molecular Models

2 - 3D Molecular Models - Molecular Shapes Putting it all...

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Molecular Shapes Putting it all together
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SeO 2 One more example: What’s the Lewis Dot Structure for SeO 2 ? 1 st question: What’s the total # of valence electrons?
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Dot structure for SeO 2 SeO 2 18 total valence electrons. Next question: What’s the central atom?
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Dot structure for SeO 2 O — Se — O Now? Fill the octets
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Dot structure for SeO 2 .. .. .. :O — Se — O: ¨ ¨ ¨ Once we’ve filled the octets, what do we do? Check the total # of valence electrons 20 total electrons – too many! So, what do we do? Make a bond!
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Dot structure for SeO 2 .. :O = Se — O: ¨ ¨ ¨ Are we done? Check the formal charges. FC(left O) = 6 – 2 – 4 = 0 FC(Se) = 6 – 3 – 2 = 1 FC(right O) = 6 – 1 – 6 = -1 Acceptable. Are we done yet?
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RESONANCE
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Dot structure for SeO 2 .. :O = Se — O: ¨ ¨ ¨ .. :O — Se = O: ¨ ¨ ¨ Resonance is always good!
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SO 2 One final example: What’s the Lewis Dot Structure for SO 2 ? 1 st question: What’s the total # of valence electrons?
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Dot structure for SO 2 SO 2 18 total valence electrons. Next question: What’s the central atom?
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Dot structure for SO 2 O — S— O Now? Fill the octets
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Dot structure for SO 2 .. .. .. :O — S — O: ¨ ¨ ¨ Once we’ve filled the octets, what do we do? Check the total # of valence electrons 20 total electrons – too many! So, what do we do? Make a bond!
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Dot structure for SO 2 ..
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