Particle model of matter

  • 465 BCE

    Democritus

    hypothesised that every thing is made up of tiny dicrete particles which cannot be broken.These were called atoms
  • 460 BCE

    Aristotle

    Said that atoms can be divided into smaller parts
  • John Dalton

    Suggested that matter is made up of small discrete particles like balls
  • Robert Brown

    Observed some dead pollen in water were constantly moving.Known as Brownian motion
  • Albert Eienstein

    Explained dead pollens were moving because they were being bombarded by water particles

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