1. Bromide   SO4   Br   S   NO3   Hint Half-n-half Clue   2. Sulfite   Cl   NH4   SO3   CO3   Half-n-half Clue   3. Sulfide   HSO4   S   Cl   SO4   Half-n-half Clue   4. Chloride   Cl   S   Br   HSO3   Half-n-half Clue   5. Nitrate   HSO3   I   CO3   NO3   Half-n-half Clue   6. Bisulfite or Hydrogen sulfite   PO4   NO3   NH4   HSO3   Half-n-half Clue   7. Iodide   I   HSO4   HCO3   O   Half-n-half Clue