1. Chlorite   PO3   BrO2   ClO2   C2H3O2   Hint Half-n-half Clue   2. Perchlorate   HPO4   ClO4   IO2   CrO4   Half-n-half Clue   3. Thiosulfate (S2O3)   BrO4   Cr2O7   S2O3   IO2   Half-n-half Clue   4. Dihydrogen Phosphate   BrO4   H2PO4   CNO   BrO   Half-n-half Clue   5. Bromate   BrO4   BrO3   MnO4   HPO4   Half-n-half Clue   6. Cyanate   CNO   O2   BrO3   H2PO4   Half-n-half Clue   7. Chromate   C2O4   CrO4   BrO3   IO   Half-n-half Clue