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Presentation transcript:

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

Steric Number 2 Linear Linear 180°

Steric Number 3 Examples: Examples: SO3, BF3, CO32- SO2, CCl2 Trigonal Planar Trigonal Planar Bent Trigonal Planar 120° <120° Examples: SO3, BF3, CO32- Examples: SO2, CCl2

Steric Number 4 Examples: Examples: Examples: CH4, SiH4, PO4 NH3, PI3 Tetrahedral Tetrahedral Tetrahedral Bent Trigonal Pyramidal Tetrahedral <109.5° and <AX3E <109.5° 109.5° Examples: CH4, SiH4, PO4 Examples: NH3, PI3 Examples: H2O, OF2

Steric Number 5 Examples: PCl5, SbF5 Examples: TeCl4, SF4 Examples: Trig. Bipyramidal Trig. Bipyramidal Trig. Bipyramidal Trig. Bipyramidal Trig. Bipyramidal See-saw T-shaped linear <90°, <120° 90°, 120° <90° 180° Examples: PCl5, SbF5 Examples: TeCl4, SF4 Examples: ClF3, SeO32- Examples: I3-, XeF2

Steric Number 6 Examples: SF6, Mo(CO)6 Examples: IF5, BrF5 Examples: Octahedral Octahedral Octahedral Square Pyramidal Square planar Octahedral <90° 90° 90° Examples: SF6, Mo(CO)6 Examples: IF5, BrF5 Examples: XeF4, ClF4-

Review To decide on the molecular geometry you must determine both the steric and coordination number. The steric number is based on electron groups. AKA bonded atoms and lone pairs. This determines your electron geometry. Molecular geometry takes into account that some of those groups may be lone pairs not bonded atoms.