SrCr2O7 is the chemical formula for strontium dichromate.
+6This compound has dichromate in it (Cr2O7-2). Oxygen almost always has an oxidation state of -2, which means the total charge for the oxygens is -14. The charge on the two chromates combined needs to be two less than the total charge on the oxygens because the ion has an overall charge of -2. Thus, the oxidation state for Cr is +6.
Sr(IO2)2 this salt is hypothetical, no iodite salts have been isolated.Chlorites are known and a bromite.Read more: What_is_the_chemical_formula_for_aluminum_ioditeRead more: What_is_the_chemical_formula_for_aluminum_ioditeRead more: What_is_the_chemical_formula_for_aluminum_ioditeRead more: What_is_the_chemical_formula_for_aluminum_iodite