Review: - For overall charge, compare the number of electrons depicted with the sum of the valence electrons for the free atoms. (Remember that an electron has a negative charge.) - Rules Governing Formal Charge - Rules for Assigning Oxidation States. Last trial left These are incorrect answers: Part 1) -2; part2 ) -1 part3) +6 Part 1) -7; part2 ) +3 part3) +7 Part 1) 0 part2 ) -2. part3) +7 Part 1) 0 part2 ) -1 part3) +7