History of the Atom

By Joey.Porter
  • 465 BCE

    Democritus

    Democritus stated that atoms were very small amounts of matter.He thought that they could not be destroyed. He hypothesized that atoms couldn't be different shapes or sizes, couldn't differ in temperature, were invisible and are constantly moving.
  • 340

    Aristotle

    Aristotle was a famous philosopher and had some views on the Atomic theory. He thought the Atomic theory was wrong. His idea was that all matter was made of the elements water, fire, earth and air. The fact that he was more popular than Democritus caused Democritus`s theory to be dismissed for about 2,000 years.

  • John Dalton

    His atomic theory stated that elements were made of atoms and that elements are all different from each other because they have different mass. He also thought that atoms in an element all had the same mass and were identical. He thought that chemical reactions were the rearranging of atoms.