Models of Matter

  • 200


    A greek democritus suggested that matter is made up of tiny particles that can not be broken down further
  • 350

    about 350 B.C.

    about 350 B.C.
    The Philosopher Aristotle believed in Empedocles "four elements" model despite the more recent "atomic" model
  • 450

    about 450 B.C.

    a greek scholar named Empedocles proposed that matter was composed of four elements Water,Fire.Air and Earth. these elements mixed togather in different proportions to yield diffrent substances.
  • 500

    A.D. 500-1600

    A.D. 500-1600
    Many alchemists believed that they did. ( combination of philosopher, mystic, magician and chemist.
  • 1650

    An english scientist , Robert Boyle, did not belive in the four elements model. He made a new definition for the word element.
  • late 1700s

    late 1700s
    Joseph Priestly was the first person to isolate oxygen scientifically, but he didnt know that oxygen is a element. that fact was recognized ny Antoine Lavoisier.
  • 1800s

    Daltons atomic model cannot explain why, on a dry winter day, you get a spark when you touch a metal doorknob. ( chargeg an ekectricity that may build up an object )
  • 1808

    by this time it was generally accepted that matter was made of elements : the two models have come togather
  • 1904

    J.J. thomson revised that atomic model further: to explane his discovery to very light negative particles , called electrons.
  • 1911

    Ernest Rutherford working at McGill university in montreal, designed an experiment to test Thomson's and Nagaoka's model.