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1. Flourine: |
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1. Flourine: |
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2. Magnesium:
3. Argon:
4. Lithium:
5. Hydrogen:
6. Sodium:
7. Potassium:
8. Boron:
9. Aluminum
10. Helium:
11. Silicon:
12. Chlorine:
13. Beryllium:
14. Nitrogen:
15. Neon:
16. Phosphorus:
17. Oxygen:
18. Calcium:
19. Sulfur:
20. Carbon: