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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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