1. Perbromate   S2O3   C2O4   BrO4   BrO3   Hint Half-n-half Clue   2. Hypochlorite   ClO3   SCN   ClO   HPO4   Half-n-half Clue   3. Chlorite   IO   ClO2   SCN   IO2   Half-n-half Clue   4. Chromate   IO2   ClO4   NO2   CrO4   Half-n-half Clue   5. Periodate   IO4   C2H3O2   BrO4   SCN   Half-n-half Clue   6. Cyanate   CN   CNO   C2H3O2   BrO   Half-n-half Clue   7. Thiocyanate   SCN   H2PO4   NO2   IO4   Half-n-half Clue