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EARLY CONCEPTS AND DEVELOPMENTS ABOUT ATOMS, MODELS OF ATOM, REFERENCES,…

- - - - Suggested the different types and combinations of these particles were responsible for the various forms of matter.
- - - - Supported Proust's idea at an atom level.
        
        Made some alteration and postulated Proust’s law
- - - - He describes atoms as small, hard spheres that are indivisible, and that atoms of a given element are identical to each other.
    - - Came up with the first set of chemical symbols for the known elements.
- - - - Mendeleyev’s periodic table of 1869 contained 17 columns
    - - Proposed a table with eight columns obtained by splitting each of the long periods into a period of seven.