1. Bisulfate or Hydrogen sulfate   NH4   S   CO3   HSO4   Hint Half-n-half Clue   2. Sulfate   Cl   S   OH   SO4   Half-n-half Clue   3. Oxide   O   OH   SO3   I   Half-n-half Clue   4. Ammonium   CO3   NO3   NH4   SO3   Half-n-half Clue   5. Sulfite   Br   S   SO3   HSO3   Half-n-half Clue   6. Carbonate   Br   SO4   S   CO3   Half-n-half Clue   7. Sulfide   S   I   Br   HCO3   Half-n-half Clue