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IIT JEE Class 12 2019 : Chemistry

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Chemistry 1013 Electron Geometry and Molecular Shape (VSEPR) This document is a collection of various illustrations/tables of electron geometry and molecular shape featuring AXE codes. Most to the illustrations/tables use ball and stick models; on page 5 there are simple 3D illustrations. Use this document and your lecture notes to fill in the VSEPR study chart (found in a both a pdf and an excel file). This is a great exercise for your brain dump. Eventually you should have this material condensed into a small table (see the instructions at the bottom of the VSEPR study chart). You should end up with a table similar to the one Dr. Ellis presented to his chemistry section (page 6). 1 Unfortunately, this table only covers 2-4 electron groups, but the same concepts can be applied to the 5 and 6 electron groups. Note that there will be two exceptions to the guideline that molecules containing lone pairs will be polar. This occurs in AXE codes AX2E3 and AX4E2. In AX2E3, the 3 electron pairs occupy the 3 equatorial positions and the two atoms, X, the axial positions. The resulting molecular shape is linear, and if X is the same atom in both positions, the dipoles will cancel each other. Similarly, in AX4E2 the 2 lone pairs occupy the axial positions, with the 4 atoms, X, the equatorial positions, giving a square planar molecular shape. Again, if X is the same atom in all four positions the diploes will cancel each other. 2 3 4 5 6

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