The development of the periodic table occurred over many decades as scientists discovered elements and recognized patterns in their properties. Early proposals included Dobereiner's law of triads in 1829 and Newlands' law of octaves in 1863. However, Dmitri Mendeleev is considered the father of the periodic table for his 1869 table that predicted undiscovered elements. Later, noble gases like argon were discovered and placed on the table. The modern periodic table was influenced by discoveries of atomic structure and isotopes that explained the periodic recurrence of properties.

1. The Brief History of the Development of Periodic Table

2. In the beginning By 1869, a total of 63 elements had been discovered.

3. Scientists began to develop classification schemes.

4. Law of Triads

5. In 1829, Johann Dobereiner proposed that nature contained triads of elements.

6. First attempt at designing a periodic table

7. In 1862, De Chancourtois transcribed a list of the elements positioned on a cylinder in terms of increasing atomic weight.

8. Law of octaves

9. In 1863, John Newlands classified the 56 established elements into 11 groups based on similar physical properties.

10. Who Is The Father of the Periodic Table?

11. Mendeleev's table became available to the scientific community via publication (1869) before Meyer's appeared (1870).

12. Mendeleev’s periodic table was formed by arranging cards for each of the known 63 elements.

13. The table showed similarities in an entire network of vertical, horizontal, and diagonal relationships.

14. In 1906, Mendeleev came within one vote of being awarded the Nobel Prize for his work.

15. Discovery of the Noble Gases

16. In 1895, Lord Rayleigh reported the discovery of a new gaseous element named argon.

17. In 1898, William Ramsey suggested that argon be placed in a family with helium.

18. Atomic Structure and the Periodic Table

19. Scientists of the 20th Century attempted to explain why the properties of the elements recur periodically.

20. The discovery of isotopes of the elements revealed the properties of the elements varied periodically with atomic number. .

21. The Modern Periodic Table

22. Seaborg reconfigured the periodic table by placing the actinide series below the lanthanide series.

23. In 1951, Seaborg was awarded the Nobel Prize in chemistry for his work.

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