1. Chlorite   BrO   CNO   ClO2   IO3   Hint Half-n-half Clue   2. Oxalate   IO4   H2PO4   C2O4   SCN   Half-n-half Clue   3. Permanganate   MnO4   BrO3   PO3   ClO2   Half-n-half Clue   4. Chromate   SCN   CrO4   O2   BrO3   Half-n-half Clue   5. Acetate   PO3   C2H3O2   BrO3   IO4   Half-n-half Clue   6. Hypochlorite   Cr2O7   S2O3   ClO3   ClO   Half-n-half Clue   7. Peroxide (O2)   O2   IO   ClO4   HPO4   Half-n-half Clue