The Atomic Theory Timeline

  • Aristotle
    330

    Aristotle

    He was a pholosifer and he wrote the pholosiph on life, litericture, polotics, etc.
    he wrote on many different topics and was a very smart man of his time
  • Democritus
    400

    Democritus

    he descovered the atomic hypolthosis
    he said that everything was made of atoms which are invisable and are alwasys in motion
  • John Dalton

    John Dalton

    He Created the Atomic Theory
    He stated the 5 main points of the theory
    1.Elements are made of extremely small particles called atoms.
    2.Atoms of a given element are identical in size, mass, and other properties; atoms of different elements differ in size, mass, and other properties.
    3.Atoms cannot be subdivided, created, or destroyed.
    4.Atoms of different elements combine in simple whole-number ratios to form chemical compounds.
    5.In chemical reactions, atoms are combined, separated, or rearra
  • JJ Thomson

    JJ Thomson

    he discovered that the unites were 1000 times smaller that the atom he used cothode rays to discover it
  • Ernest Rutherford

    Ernest Rutherford

    he reaserched on radioactivity and soon createded the "half life" of something
  • Albert Einstein

    Albert Einstein

    he was a very smat many who invented many things but was most famous for his math skills and scientific skills
  • Niels Bohr

    Niels Bohr

    he founded the contribulion of the atomic stucture.
  • Electron Cloud Model

    Electron Cloud Model

    a positively charged nucleus, with a cloud-like collection of electrons surrounding it. The cloud represents where the electrons could be, not where they are at a given moment. This model also insists that electrons travel randomly around the nucleus without any certain pattern.
  • James Chadwick

    James Chadwick

    He discovered the nutron
    he studyed them for many years before he presented it
  • Marie Curie

    Marie Curie

    she was researching on radioactivity and did'nt knoiw the effect of it and soon died from the exposure