1. Iodate   IO3   CrO4   IO4   C2O4   Hint Half-n-half Clue   2. Cyanate   CNO   Cr2O7   NO2   BrO   Half-n-half Clue   3. Bromite   C2O4   IO   ClO2   BrO2   Half-n-half Clue   4. Hypoiodite   BrO   HPO4   Cr2O7   IO   Half-n-half Clue   5. Perchlorate   ClO2   ClO   ClO4   CNO   Half-n-half Clue   6. Monohydrogen phosphate   BrO4   ClO   HPO4   IO3   Half-n-half Clue   7. Bromate   BrO3   BrO2   IO2   ClO4   Half-n-half Clue