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List of periodic table elements 1-20
1. Hydrogen (Hy)
2. Helium (H)
3. Lithium (L)
4. Beryllium (B)
5. Boron (Bo)
6. Carbon (Ca)
7. Nitrogen (Ni)
8. Oxygen (Ox)
9. Fluorine (Fl)
10. Neon (N)
11. Sodium (S)
12. Magnesium (M)
13. Aluminum (Am)
14. Silicon (Sc)
15. Phosphorus (Po)
16. Sulfur (Su)
17. Chlorine (C)
18. Argon (A)
19. Potassium (P)
20. Calcium (Cl)