Atomic theory scientists

By hcps-delcidmig
  • 440 BCE

    Democritus

    Democritus
    He proposed that everything in the world was made of very small particles surrounded by empty space he also speculated that they all vary in size and shape which depends on the substance they compose. His model was just a simple round solid ball. All he knew that everything was composed of atoms he called is indivisible
  • Period: 440 BCE to

    Scientists

    Democritus, John Dalton, J.J Thomson, Ernest Rutherford, Niels Bohr, Isaac Newton

  • Issac Newton

    Issac Newton
    He studied gasses and the possibility of atoms existing He proposed a mechanical universe where small solid masses were in motion

  • John Dalton

    John Dalton
    He showed that similar substances always broke down into the same elements in the same proportions he concluded that various compounds were combinations of atoms of different elements that cannot be created or destroyed. He proposed that all matter is composed of very small things he called atoms

  • J.J Thomson

    J.J Thomson
    He discovered the electron He showed atoms as uniformly packed spheres of positive matter filled with negatively charged electrons He proposed the plum pudding model of the atom which he called corpuscles

  • Ernest Rutherford

    Ernest Rutherford
    He overturned Thomson’s model he has a well-known foil experiment in which he demonstrated that the atom has a tiny heavy nucleus he concluded that atoms consisted largely of empty space with few electrons which most of the mass was in the nucleus. His model was a gold foil experiment which proved that Thomson’s plum pudding was incorrect

  • Niels bohr

    Niels bohr
    He expanded on Rutherford’s nuclear model, drawing on work by max Planck and albert Einstein He stipulated that electrons orbit the nucleus at fixed energies and distances Depicts the atom as a small positively charged nucleus surrounded by electrons that traveled around the nucleus in circles

  • Enrico Fermi

    Enrico Fermi
    Created the worlds first nuclear reactor He has been called the "architect of the nuclear age" and the "architect of the atomic bomb”. His model was that he Conducted the first controlled chain reaction releasing energy from the atoms nucleus