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11_Shapes.pdf

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Department
Chemistry
Course
CHEM 1E03
Professor
Weisner
Semester
Winter

Description
Molecular Shape Molecules have shape - egs. Methane CH : 4 ♣ Water H 2 : ♣ Can we predict these shapes? Valence Shell Electron Pair Repulsion Model 1 VSPRE Electron pairs 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 c.se of free radicals 104 Arrangement of Electron Domains (pairs) about a central atom ... ♣ Two Domains of Electrons ... one shape results: ♣ The AX E notation is used to denote n+m electron groups n m 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). 105 Three Domains of Electrons ... two shapes result: ♣ egs. ♣ AX 3 BF 3s trigonal planar ♣ AX 2 SnCl is bent 2 106 Four Domains of Electrons ... three shapes result: ♣ egs. ♣ AX 4 CH 4s tetrahedral .. Br 2−AX3E − . S .. . O O..- SO 3trigonale .O.. ... .. .. O .. pyramidal .. . . - like 3H - ♣ H O is bent - like S2Cl 107 Five Domains of Electrons ... four shapes result: ♣ ♣ egs. ♣ AX 5 PCl5is trigonal bipyramidal ♣ AX E 4 SF4is seesaw shaped 108 ♣ AX 3 2 BrF3is T-shaped ♣ AX E2 3 − I3is linear Six Domains of Electrons ... five shapes result: ♣
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