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Elements You Have to Memorize p. 77. 1. Helium. 2. Carbon. 3. Calcium. 4. Aluminum. 5. Iodine. 6. Magnesium. 7. Cl. 8. Au. 9. H. 10. Pb. 11. Mercury. 12. P. 13. Fe. 14. Oxygen. 15. Ni. 16. Potassium. 17. Nitrogen. 18. Ag. 19. Zn. 20. Uranium. 21. Silicon.
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