Lect_W10_151 weso (short)

Lect_W10_151 weso (short) - UA GenChem General Chemistry...

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Unformatted text preview: UA GenChem General Chemistry General Chemistry CHEM 151 CHEM 151 Week 10 UA GenChem VSEPR VSEPR THEORY THEORY V V alence alence S S hell hell E E lectron lectron P P air air R R epulsion Theory epulsion Theory The most important factor in determining The most important factor in determining geometry is the relative repulsion between geometry is the relative repulsion between electron groups electron groups around the central atom around the central atom Molecular Geometry Molecular Geometry Molecules adopt the shape Molecules adopt the shape that minimizes the electron that minimizes the electron repulsions repulsions UA GenChem We will roughly approximate a single bond, double bond, triple bond or unshared pair as one Electron Group or a region of electron density. : : .. .. .. .. O O O Cl F F : : .. .. .. .. .. .. Xe F F F F F F Br F F F . . . . Unshared pairs on F not shown Electron Groups Electron Groups The central atom in each structure has ______ bonds and _______ electron groups? .. .. .. O C O .. UA GenChem How do you find the electron geometry of any molecule ? a) Build the best Lewis structure of the molecule b) Count the number of electron groups around the central atom. c) Identify the shape in which the repulsion of groups would be minimal. Electron Group Geometry Electron Group Geometry UA GenChem Molecular Geometry Molecular Geometry The distribution of electrons in a molecule determines and is determined by how the atoms arrange in space. UA GenChem TWO Groups around central atom H C N : .. .. .. O C O .. .. .. .. Be F F : : .. The least repulsion from two groups, like two balloons is to arrange in a straight line. Electron Geometry LINEAR .. .. .. O C O .. UA GenChem . . . . N H N H THREE Groups around central atom Electron Geometry TRIGONAL PLANAR C H H O : : The least repulsion from three groups, like three balloons is to arrange in a flat triangle....
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Lect_W10_151 weso (short) - UA GenChem General Chemistry...

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