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# Vsepr

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### Vsepr

1. 1. VSEPR andMolecularGeometry Hemoglobin
2. 2. ModelsModels are attempts to explain hownature operates on the microscopic levelbased on experiences in the macroscopicworld.Models can be physical aswith this DNA modelModels can be mathematicalModels can be theoreticalor philosophical
3. 3. Fundamental Properties of Models A model does not equal reality. Models are oversimplifications, and are therefore often wrong. Models become more complicated as they age. We must understand the underlying assumptions in a model so that we don’t misuse it.
4. 4. VSEPR Model(Valence Shell Electron Pair Repulsion) The structure around a given atom is determined principally by minimizing electron pair repulsions.
5. 5. Predicting a VSEPR Structure Draw Lewis structure. Put pairs as far apart as possible. Determine positions of atoms from the way electron pairs are shared Determine the name of molecular structure from positions of the atoms.
6. 6. Steric Number 11 atom bonded to another atom BasicSteric Geometry No. 2 lone 3 lone 4 lone 0 lone pair 1 lone pair pairs pairs pairs 1 linear
7. 7. Steric Number 22 atoms, or lone electron pairs, or acombination of the two, bonded to a centralatom. BasicSteric Geometry No. 0 lone pair 1 lone pair 2 lone pairs 3 lone pairs 2 linear linear
8. 8. Steric Number 33 atoms, or lone electron pairs, or acombination of the two, bonded to a centralatom. BasicSteric Geometry No. 0 lone pair 1 lone pair 2 lone pairs 3 lone pairs 3 trigonal planar bent / angular linear
9. 9. Steric Number 4 4 atoms, or lone electron pairs, or a combination of the two, bonded to a central atom. BasicSteric Geometry No. 2 lone pairs 3 lone pairs 0 lone pair 1 lone pair 4 trigonal tetrahedral pyramid bent / angular linear
10. 10. Steric Number 55 atoms, or lone electron pairs, or acombination of the two, bonded to a centralatom. BasicSteric Geometry No. 0 lone pair 1 lone pair 2 lone pairs 3 lone pairs 5 trigonal sawhorse / bipyramid seesaw t-shape linear
11. 11. Steric Number 66 atoms, or lone electron pairs, or acombination of the two, bonded to a centralatom. BasicSteric Geometry No. 0 lone pair 1 lone pair 2 lone pairs 3 lone pairs 6 square Octahedral square planar pyramid
12. 12. Steric Number 77 atoms, or lone electron pairs, or acombination of the two, bonded to a centralatom. BasicSteric Geometry No. 0 lone pair 1 lone pair 2 lone pairs 3 lone pairs 7 pentagonal pentagonal bipyramidal pyramidal