Periodic Table

I had to memorize the periodic table before, but you should know at least the first 20 elements by heart.

1. Hydrogen
2. Helium
3. Lithium
4. Beryllium
5. Bore
6. Carbon
7. Nitrogen
8. Oxygen
9. Fluorine
10. Neon
11. Sodium
12. Magnesium
13. Aluminum
14. Silicon
15. Phosphorus
16. Sulfur
17. Chlorine
18. Argon
19. Potassium
20. Calcium
21. Scandium
22. Titanium
23. Vanadium
24. Vanadium
25. Manganese
26. Iron (Fe)
27. Cobalt
28. Nickel
29. Copper
30. Zinc
31. Gallium
32. Germanium
33. Arsenic
34. Selenium
35. Bromine
36. Krypton