Atom Timeline

Timeline created by Hopkil
  • 400

    Democritus

    Democritus
    stated that all matter is made up of atoms. He also stated that atoms are eternal and invisible and so small that they can’t be divided, and they entirely fill up the space they’re in.
  • Lavoisier

    Lavoisier
    He provided the formula for the conservation of matter in chemical reactions, and also compared between an element and a compound.
  • Charles Couloumb

    Charles Couloumb
    Made a law that the force between two eletrical charges and inersely distance between them, one of the main forces involved in atomic reactions.
  • John Dalton

    John Dalton
    formed the atomic theory, which he made out that the matter is made up of tiny, indestructible particles called atoms that are all alike and have the same atomic weight.
  • j.j Thomson

    j.j Thomson
    discovered the electron and developed the "plum-pudding" model of the atom.
  • Robert Millikan

    Robert Millikan
    discovered the electric charge of the electron
  • Ernest Rutherford

    Ernest Rutherford
    used the results of his gold-foil experiment to state that all the mass of an atom were in a small positively-charged ball at the center of the atom.
  • Neils Bohr

    Neils Bohr
    Figured that the electrons moved around the nucleus in large orbits. He also presented the Bohr atomic model which stated that atoms absorb or emit radiation only when the electrons abruptly jump between different atoms
  • Geiger

    Geiger
    Made the first detector of alpha particles
  • Chadwick

    Chadwick
    discovered the neutrally-charged neutron.
  • Otto Hahn

    Otto Hahn
    discovered nuclear fission, in which the nucleus in an atom breaks up into two separate nuclei, while experimenting with uranium.
  • Glen T. Seaborg

    Glen T. Seaborg
    isolated and identified elements heavier than uranium, and in the process, added elements number 94 - 102, and 106.
  • Murray Gell-Mann and George Zweig

    Murray Gell-Mann and George Zweig
    brought forth the idea of "quarks", little bits of matter which when used kind of like building blocks, serve to explain some complex chemical substances.
  • Period: to

    history of atom