v. 1. Hydrogen and the noble gases -- v. 2. Sodium and potassium -- v. 3. Calcium and magnesium -- v. 4. Iron, chromium and manganese -- v. 5. Copper, silver and gold -- v. 6. Zinc, cadmium and mercury -- v. 7. Aluminum -- v. 8. Carbon -- v. 9. Silicon -- v. 10. Lead and tin -- v. 11. Nitrogen and phosphorus -- v. 12. Oxygen -- v. 13. Sulfur -- v. 14. Chlorine, fluorine, bromine, and iodine -- v. 15. Uranium and other radioactive elements.