1 / 5

Molecular Geometry

Molecular Geometry. Now we can use what we know about molecules from their lewis dot structures to determine their 3 dimensional shape in space. Today you will research what types of shapes molecules take in space and why.

zubeda
Download Presentation

Molecular Geometry

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Molecular Geometry Now we can use what we know about molecules from their lewis dot structures to determine their 3 dimensional shape in space. Today you will research what types of shapes molecules take in space and why. The site below gives a brief overview of some of the most popular molecular shapes and some of the properties that help to determine these shapes http://library.thinkquest.org/10429/low/geometry/geobody.htm

  2. ValenceShellElectronPairRepulsionTheory Planar triangular Tetrahedral Trigonal bipyramidal Octahedral

  3. VSEPR Theory • Based on Lewis structures we can know the shape or “geometry” of molecules • The theory that predicts geometry (based on Lewis structures) is abbreviated VSEPR • VSEPR (pronounced “vesper”) stands for Valence Shell Electron • Pair Repulsion • VSEPR, as the name suggests, predicts geometry based on the repulsion of electron pairs (in bonds or by themselves) • Electrons around the central nucleus repel each other. Thus, resulting structures have atoms maximally spread out.

  4. VSEPR overview • The balloons represent electron clouds. At the end of each balloon will be a peripheral atom. The balloons meet at a central atom. • Each shape containing 2-6 peripheral atoms has a name • Sometimes the molecules are represented by AXY, where Y is the # of peripheral atoms • AX2 = linear • AX3 = planar triangular • AX4 = tetrahedral (tetra = 4 faces) • AX5 = trigonalbipyramidal (2 pyramids) • AX6 = octahedral (octa = 8 faces) Can you identify the correct shapefor the #’s of balloons above?

  5. Ball and stick models showing molecular geometry Planar triangular Tetrahedral Trigonal bipyramidal Octahedral

More Related