2. Calcium Ca 2+
3. Potassium K 1+
4. Magnesium Mg 2+
5. Lithium Li 1+
6. Barium Ba 2+
7. Aluminum Al 3+
8. Fluoride F 1-
9. Oxide O 2-
10. Sulfide S 2-
11. Chloride Cl 1-
12. Zinc Zn 2+
13. Sulfite (SO3) 2-
14. Sulfate (SO4) 2-
15. Phosphate (PO4) 3-
16. Carbonate (CO3) 2-
17. Bicarbonate (HCO3) 1-
18. Hydroxide (OH) 1-
19. Nitrate (NO3) 1-
20. Ammonium (NH4) 1+