1. Oxalate   BrO4   C2O4   PO3   BrO2   Hint Half-n-half Clue   2. Hypoiodite   C2O4   ClO2   IO   ClO4   Half-n-half Clue   3. Dihydrogen Phosphate   PO3   H2PO4   ClO2   CrO4   Half-n-half Clue   4. Peroxide (O2)   SCN   CN   ClO3   O2   Half-n-half Clue   5. Chlorite   ClO2   NO2   C2H3O2   C2O4   Half-n-half Clue   6. Bromate   H2PO4   BrO   MnO4   BrO3   Half-n-half Clue   7. Thiosulfate (S2O3)   ClO   CNO   SCN   S2O3   Half-n-half Clue