1. Peroxide (O2)   CrO4   SCN   O2   IO   Hint Half-n-half Clue   2. Dichromate (Cr2O7)   PO3   S2O3   BrO3   Cr2O7   Half-n-half Clue   3. Thiosulfate (S2O3)   IO3   S2O3   CN   IO4   Half-n-half Clue   4. Iodite   IO2   BrO4   Cr2O7   IO3   Half-n-half Clue   5. Phosphite   CNO   ClO3   PO3   IO   Half-n-half Clue   6. Chlorate   ClO3   CNO   BrO4   CN   Half-n-half Clue   7. Dihydrogen Phosphate   HPO4   H2PO4   BrO3   IO   Half-n-half Clue