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8 Chemical Bonding Solutions to Exercises charges: assign electrons to individual atoms [nonbonding e- + 1/2 (bonding formal charge = valence electrons - assigned electrons. Assign oxidation numbers, assuming that the more electronegative element holds all electrons in a bond. Solve. Formal charges are shown near the atoms, oxidation numbers (ox. #) are listed below the structures. (a) 16 e-, 8 pairs (b) 26 valence e-, 13e⁻ pairs -1 0 0 0 +1 #: S, +4; -1; O, -2 (c) 26 valence 13 pairs (d) 20 valence 10 pairs -1 1- 0 +1 +2 #: Br, +5; O, -2 #: +3; H, +1; O, -2 Check. Each atom is surrounded by an octet (or duet) and the sum of the formal charges and oxidation numbers is the charge on the particle. 8.52 Formal charges are given near the atoms, oxidation numbers are listed below the structures. (a) 18 9 pairs (b) 24 12 pairs -1 +1 -1 (c) 13 pairs +1 2- -1 (d) SO₂