Periodic Table and Properties of Elements

1. Dobereiner's Triads

2. Groups of three elements which showed similar properties.

3. Modern Periodic Table

4. Increasing the Atomic Number

5. Different number of protons

6. Different number of neutrons

7. Unique mass number

8. Different atomic number of each element

9. Grouping of Elements

10. Metals

11. Non-Metals

12. Semi Metals

13. Mendeleev's Periodic Table

14. Increasing order of their atomic masses and properties.

15. Newland Octaves

16. Compared with piano octaves found in music.

17. John Alexander Newlands

18. Henry Moseley

19. Dmitri Ivanovich Mendeleev

20. Johann Wolfgang Dobereiner