CH 301 chapter 3a molecular shape Atkins and Jones

Ch 301 chapter 3a molecular shape atkins and jones

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: CH 301 Chapter 3a Molecular Shape and Structure of Molecules 1 The Valence Shell Electron Pair Repulsion Model (VSEPR) The VSEPR model describes the 3-D arrangement 3of bonded atoms based on the geometric shape in which a molecule will take as a result of electron repulsion. The shape of molecules are constructed empirically by following the rules described by the VSEPR model. 2 Basic Geometric Shapes 3 4 Shapes and Polarity of Molecules (VSEPR--Valence Shell Electron Pair (VSEPR-- Repulsion theory) Electronic shape - counting regions of high electron density Each bond is counted as one region of high electron 1. density. Each double bond and each triple bond is counted as one 2. region of high electron density. Each pair of unshared electrons is counted as one region 3. of high electron density. 5 Electronic shape--counting Regions of High shape-- Electron Density (RHED) Rules: Draw the Lewis structure of the molecule. 2. Determine the central atom. 3. Determine the number of high electron densities around the central atom. atom. 4. Determine the electronic structure based on geometric structure of molecule. 1. 6 7 Table 8-1, p.307 VSEPR Theory 1. Two regions of high electron density around the central atom. 8 VSEPR Theory 2. Three regions of high electron density around the central atom. 9 VSEPR Theory 3. Four regions of high electron density around the central atom. 10 Tetrahedran 11 p.315 12 13 p.320 Tetrahedran Geometry 14 p.322 Tetrahedran Geometry Slide 8 Fig. 12-5, p. 328 15 Regions of High Electron Density 16 p.308 VSEPR Theory 4. Five regions of high electron density around the central atom. 17 equatorial axial Trigonal Bipyramidal Geometry 18 p.327 VSEPR Theory 5. Six regions of high electron density around the central atom. 19 Octahedral Geometry 20 p.331 Hybrid Orbitals: (Valence Bond Theo...
View Full Document

Ask a homework question - tutors are online