Vsepr

[Fernandbteich]

1. The problem statement, all variables and given/known data
Hi
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
Regards