1. Thiocyanate   SCN   PO3   BrO3   ClO3   Hint Half-n-half Clue   2. Perbromate   Cr2O7   CN   ClO3   BrO4   Half-n-half Clue   3. Thiosulfate (S2O3)   CN   BrO   ClO4   S2O3   Half-n-half Clue   4. Phosphite   SCN   ClO3   PO3   ClO4   Half-n-half Clue   5. Hypochlorite   BrO   ClO   IO3   PO3   Half-n-half Clue   6. Cyanide   ClO   SCN   CN   H2PO4   Half-n-half Clue   7. Cyanate   CNO   IO2   SCN   CN   Half-n-half Clue