1. Bromite   BrO2   C2H3O2   ClO   H2PO4   Hint Half-n-half Clue   2. Chlorite   IO   IO3   BrO   ClO2   Half-n-half Clue   3. Thiocyanate   CNO   ClO3   SCN   IO2   Half-n-half Clue   4. Perchlorate   S2O3   ClO4   IO2   C2O4   Half-n-half Clue   5. Chlorate   C2O4   C2H3O2   ClO3   H2PO4   Half-n-half Clue   6. Peroxide (O2)   IO   O2   MnO4   BrO3   Half-n-half Clue   7. Acetate   SCN   C2H3O2   HPO4   BrO4   Half-n-half Clue