18. Potassium to Zirconium. 2. Sodium and potassium -- 3. Calcium and magnesium -- 4. Iron, chromium, and manganese -- 5. Copper, silver, and gold -- 6. Zinc, cadmium, and mercury -- 7. Aluminum -- 8. Carbon -- 9. Silicon -- 10. Lead and tin -- 11. Nitrogen and phosphorus -- 12. Oxygen -- 13. Sulfur -- 14. Chlorine, fluorine, bromine, and iodine -- 15. Uranium and other radioactive elements -- 16. Actinium to Fluorine -- 17. Francium to Polonium -- 18. Potassium to Zirconium.
This resource is supported by the Institute of Museum and Library Services under the provisions of the Library Services and Technology Act as administered by State Library of Iowa.