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Some Definitions

Some Definitions. Steric Number: # bonds+# electron pairs Coordination Number: number of bonded atoms. Steric #: 4 Coord . #:3. Steric #: 5 Coord . #:5. Steric #: 6 Coord . #:5. Some (more) Definitions. Electron geometry: geometry including if you “saw” electron pairs

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Some Definitions

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  1. Some Definitions • Steric Number: # bonds+# electron pairs • Coordination Number: number of bonded atoms Steric #: 4 Coord. #:3 Steric #: 5 Coord. #:5 Steric #: 6 Coord. #:5

  2. Some (more) Definitions • Electron geometry: geometry including if you “saw” electron pairs • Molecular geometry: geometry where you don’t “see” electron pairs • Bond angle: angle between bonds. EG:Tetrahedral MG: Trig. pyramidal EG:Trig. bipyramidal MG: Trig. bipyramidal EG:Octahedral MG: Square Pyramidal

  3. Pull out your worksheet, candy and toothpicks! Thanks to http://www.chemmybear.com/shapes.html for all animations on following slides!

  4. Steric Number 2

  5. Steric Number 3 Examples: SO3, BF3, CO32- Examples: SO2, CCl2

  6. Steric Number 4 Examples: CH4, SiH4, PO4 Examples: NH3, PI3 Examples: H2O, OF2

  7. Steric Number 5 Examples: PCl5, SbF5 Examples: TeCl4, SF4 Examples: ClF3, SeO32- Examples: I3-, XeF2

  8. Steric Number 6 Examples: XeF4, ClF4- Examples: IF5, BrF5 Examples: SF6, Mo(CO)6

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