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1. H Hydrogen 2. He Helium 3. Li Lithium 4. Be Beryllium 5. B Boron 6. C Carbon 7. N Nitrogen 8. O Oxygen 9. F Fluorine 10. Ne Neon 11. Na Sodium 12. Mg Magnesium 13. Al Aluminium 14. Si Silicon 15. P Phosphorus 16. S Sulfur 17. Cl Chlorine 18. Ar Argon 19. K Potassium 20. Ca Calcium |
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