4 determine the of shared e s s shared n a place

This preview shows page 1 - 2 out of 2 pages.

4.) Determine the # of shared e - ‘s (S = shared = N-A). Place single bonds between central atom and outer atoms first, then make multiple bond if necessary. 5.) Determine the # of non-shared e - ‘s (NS = non-shared = A-S). Place around outer and central atoms so that each atom has an octet. Note : Technically, there are no hard and fast rules for how a Lewis structure is drawn. The whole point is to fulfill the octet rule by allowing valence electrons to be shared between atoms. Examples : NH 3 , CO 2 , NO 3 - , NH 4 + , CO 3 2- , SO 2 V.) Molecular Shape (VSEPR Theory) A.) Basis of Theory: electron pairs (whether bonding pairs or lone pairs) tend to stay as far away from each other as possible so as to minimize electrostatic repulsion. ( see Table 10.1 on p. 319) B.) Multiple bonds are treated as single electron pairs under this theory.
Image of page 1

Subscribe to view the full document.

C.) Classifications of Electron Pair Geometries and Molecular Shape. e - Pair Classification e - Pair Geometry Molecular Classification Molecular Geometry AN 2 linear AX 2 linear AN 3 trigonal planar AX 3 trigonal planar AX 2 E bent AN 4 tetrahedral AX 4 tetrahedral AX 3 E pyramidal AX 2 E 2 bent where A is the central atom, N is the number of e - pairs on central atom, X is the number of outer atoms on central atom, E is the number of lone pairs of e - ‘s on central atom. D.) Determination of Electron Pair Geometry and Molecular Shape 1.) Determine Lewis dot structure. 2.) Assign e - pair geometry based on e - pair classification. (e.g. If a molecule is classified as AN 3 , the e - pair geometry is trigonal planar) 3.) Assign molecular geometry based on molecular classification. (e.g. If a molecule is classified as AX 3 E, the molecular shape is pyramidal) Examples : Will make up a few. 2
Image of page 2
  • Fall '07
  • MILES
  • Mole, VSEPR, Molecule, Electron Pair Geometry and Molecular Shape

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern