Question

How do i figure out the electron configuration of Fe(C2O4)3^3- ?

Answer 1

Your know the charge of the oxalate ion (you should have these memorized) http://www2.pvc.maricopa.edu/tutor/chem/chem130/nomenclature/polyatomicion.html , so knowing that, and knowing O (the basic seven rules), you know C and O. Then, you know Fe from the oxalate charge, and the overall charge of the ion.