1: H - Hydrogen

2: He - Helium

3: Le - 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 - Aluminum

14: Si - Silicon

15: P - Phosphorus

16: S - Sulfur

17: Cl - Chlorine

18: Ar - Argon

19: K - Potassium

20: Ca - Calcium

21: Sc - Scandium

22: Ti - Titanium

23: V - Vanadium

24: Cr - Chromium

25: Mn - Manganese