In the compound K2CrO4 potassium chromate , we can determine the oxidation state of the chromium ion by considering the oxidation states of the other elements in the compound.Potassium K has an oxidation state of +1, and there are two potassium ions, so the total positive charge from potassium is +2.Oxygen O typically has an oxidation state of -2, and there are four oxygen atoms, so the total negative charge from oxygen is -8.In order for the compound to be electrically neutral, the oxidation state of the chromium ion Cr must balance out the charges from potassium and oxygen. Therefore, the oxidation state of chromium in K2CrO4 is:+2 from potassium + x from chromium = -8 from oxygen x = -8 - +2 x = -6So, the oxidation state of the chromium ion in K2CrO4 is +6.