Dr. Walker-VSEPR_key - Walker CH301 Fall 2010 VSEPR Valence...

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Walker CH301 Fall 2010 Page 1 of 2 VSEPR: Valence Shell Electron Pair Repulsion theory This theory builds from Lewis dot structures to predict the 3-D arrangement of atoms in molecules. It is a theory, so exceptions can and do occur, but it works a majority of the time and so has proven useful in many cases. VSEPR relies on the understanding of the following topics: electronic configurations (or identifying valence electrons) electronegativity and ionization trends Lewis dot structures Octet rule Exceptions to the octet rule You need to learn the following shapes, bond angles, and examples: HED electronic geometry Shape #lone pr. molecular geometry bond angles Example 1 Linear Any Linear n/a H-F 2 Linear Any Linear 180 o CO 2 3 Trigonal planar 0 Trigonal planar 120 o BF 3
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Unformatted text preview: 1 Bent or angular <120 o O 3 , NO 2-“ “ 2 Linear n/a 4 Tetrahedral 0 Tetrahedral 109.5 o CH 4 , NH 4 + “ “ 1 Trigonal pyramidal <109.5 NH 3 , SO 3 2-“ “ 2 Bent or angular <109.5 H 2 O 5 Trigonal bipyramidal 0 Trigonal bipyramidal 120 o and 90 o PCl 5 “ “ 1 See-saw <120 o , <90 o SF 4 “ “ 2 T-shaped <120 o , <90 o ICl 3 , ClF 3 “ “ 3 Linear 180 o only XeF 2 , I 3-6 Octahedral 0 Octahedral 180 o and 90 o SF 6 “ “ 1 Square pyramidal <90 o only IF 5 , BrF 5 “ “ 2 Square planar 90 o only XeF 4 Walker CH301 Fall 2010 Page 2 of 2 Your Turn Draw the Lewis diagrams then determine the electronic and molecular geometry for each of the following: HOCl ClO 3-AsF 5 SiF 6 2-CH 3 CH 2 OH (multiple centers, so identify structure for each C atom and for O)...
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  • Fall '09
  • Valence Shell Electron Pair Repulsion, Linear Trigonal Planar, Linear Tetrahedral Trigonal, Walker CH301 Fall, Linear Octahedral Square pyramidal Square

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