Molecular Geometry Determination Based on Steric Number
Learn how to determine molecular geometry based on steric number. Understand the importance of electron groups and coordination number in predicting the shape of molecules. Explore different steric numbers and corresponding molecular geometries through detailed animations and examples.
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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 Trigonal Planar Trigonal Planar Bent Trigonal Planar <120 120 Examples: SO3, BF3, CO32- Examples: SO2, CCl2
Steric Number 4 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 Trig. Bipyramidal Trig. Bipyramidal Trig. Bipyramidal Trig. Bipyramidal T-shaped linear See-saw Trig. Bipyramidal <90 , <120 <90 180 90 , 120 Examples: PCl5, SbF5 Examples: TeCl4, SF4 Examples: ClF3, SeO32- Examples: I3-, XeF2
Steric Number 6 Octahedral Octahedral Octahedral Square planar Square Pyramidal Octahedral <90 90 90 Examples: SF6, Mo(CO)6 Examples: XeF4, ClF4- Examples: IF5, BrF5
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.
