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Homework Help: Using the VSEPR method

  1. Nov 11, 2008 #1
    1. The problem statement, all variables and given/known data
    I've been torturing my head for hours, trying to find the geometry of [SiO4]2- using the VSEPR method.
    Thus, I'd be really grateful if you can help me find:
    1) If [SiO4]2- really exists
    2) If it exists, then what's its geometry?

    2. Relevant equations

    3. The attempt at a solution
    Si's got 4 free electrons
    2O- and 2O need 6 electrons
    I have 2 extra electrons, it can't work imo unless the two "O"s have 1 free electron each, and Si 2 positive charges, but then the molecule would be neutral.

    Thanks in advance
  2. jcsd
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