Atomic Theory

Centuries ago, scientists and philosophers alike have pondered the idea of matter and what it is. The basic idea was put down by a scientist and then gradually expanded by others following his footsteps. In time, we have gone from a basic understanding that our world is made up of solids, liquids, and gases, to a development of nuclear physics.

Below is a timeline illustrating the scientists involved in the history of Atomic Theory.

     Democritus/
       Aristotle          Lavoisier        Dalton           Crooke      Thomson     Millikan         Bohr       Chadwick

                1650                1797             1811             1896               1900s          1911            1930
        400 BC              1789             1808               1870s            1897              1909             1913          1932    

             Gassendi           Proust        Avogadro    Rontgen/        Einstein   Rutherford     Bothe
                                                                                     Bequerel