Chapter 10 - Shapes of Molecules

Chapter 10 - Shapes of Molecules - 104 Molecular Shape...

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Unformatted text preview: 104 Molecular Shape Molecules have shape - egs. Methane CH 4 : Water H 2 O : Can we predict these shapes? V alence S hell E lectron P air R epulsion Model VSPRE Electron pairs 1 about an atom arrange themselves so as to minimize the mutual electrostatic repulsion ... Here, balloons tied at a point arrange themselves in the same way 1. More generally ... electron domains - they can be single, double, or triple bonds, lone pairs, or even unpaired electrons in the case of free radicals . 105 Arrangement of Electron Domains (pairs) about a central atom ... Two Domains of Electrons ... one shape results: The AX n E m notation is used to denote n+m electron groups with n bonded atoms and m lone pairs (unpaired electrons - which occur in free radicals - are treated the same as lone pairs in this treatment). 106 Three Domains of Electrons ... two shapes result: egs. AX 3 BF 3 is trigonal planar AX 2 E SnCl 2 is bent 107 Four Domains of Electrons ... three shapes result:...
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Chapter 10 - Shapes of Molecules - 104 Molecular Shape...

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