1. Phosphite   ClO4   BrO3   PO3   O2   Hint Half-n-half Clue   2. Chromate   HPO4   C2O4   CN   CrO4   Half-n-half Clue   3. Hypoiodite   CrO4   IO   HPO4   IO2   Half-n-half Clue   4. Chlorate   IO4   ClO3   BrO4   ClO2   Half-n-half Clue   5. Bromite   BrO2   ClO   HPO4   NO2   Half-n-half Clue   6. Dihydrogen Phosphate   BrO4   CNO   IO2   H2PO4   Half-n-half Clue   7. Bromate   IO2   BrO3   BrO   ClO4   Half-n-half Clue