Development of the Atomic theory.

By William.Liberos
  • 465 BCE

    Democritus

    This is Democritus' atomic theory:
    1.All matter consists of invisible particles called atoms.
    2. Atoms are indestructible.
    3. Atoms are solid but invisible.
    4. Atoms are homogenous.
    5. Atoms differ in size, shape, mass, position, and arrangement.
    ->Solids are made of small, pointy atoms.
    ->Liquids are made of large, round atoms.
    ->Oils are made of very fine, small atoms that can easily slip past each other.

  • John Dalton

    Dalton's fascination with gases gradually led him to formally assert that every form of matter (whether solid, liquid or gas) was also made up of small individual particles. In an article he wrote for the Manchester Literary and Philosophical Society in 1803, Dalton created the first chart of atomic weights.