The First 20 Elements of the Periodic Table

Argon

The eighteenth element on the periodic table. Chemical symbol is Ar. Atomic number is 18. Second Period.

Oxygen

The eighth element on the periodic table. Chemical symbol is O. Atomic number is 8. First Period.

Sodium

The eleventh element on the periodic table. Chemical symbol is Na. Atomic number is 11. Second Period.

Phosphorus

The fifteenth element on the periodic table. Chemical symbol is P. Atomic number is 15. Second Period.

Boron

The fifth element on the periodic table. Chemical symbol is B. Atomic number is 5. First Period.

Hydrogen

The first element on the periodic table. Chemical symbol is H. Atomic number is 1. First Period.

Silicon

The fourteenth element on the periodic table. Chemical symbol is Si. Atomic number is 14. Second Period.

Beryllium

The fourth element on the periodic table. Chemical symbol is Be. Atomic number is 4. First Period.

Calcium

The nineteenth element on the periodic table. Chemical symbol is Ca. Atomic number is 19. Second Period.

Fluorine

The ninth element on the periodic table. Chemical symbol is F. Atomic number is 9. First Period.

Helium

The second element on the periodic table. Chemical symbol is He. Atomic number is 2. First Period.

Chlorine

The seventeenth element on the periodic table. Chemical symbol is Cl. Atomic number is 17. Second Period.

Nitrogen

The seventh element on the periodic table. Chemical symbol is N. Atomic number is 7. First Period.

Sulfur

The sixteenth element on the periodic table. Chemical symbol is S. Atomic number is 16. Second Period.

Carbon

The sixth element on the periodic table. Chemical symbol is C. Atomic number is 6. First Period.

Neon

The tenth element on the periodic table. Chemical symbol is Ne. Atomic number is 10. First Period.

Lithium

The third element on the periodic table. Chemical symbol is Li. Atomic number is 3. First Period.

Aluminum

The thirteenth element on the periodic table. Chemical symbol is Al. Atomic number is 13. Second Period.

Magnesium

The twelfth element on the periodic table. Chemical symbol is Mg. Atomic number is 12. Second Period.

Potassium

The twentieth element on the periodic table. Chemical symbol is K. Atomic number is 20. Third Period.