People who contributed to the Atomic Theory

  • Period: 300 to

    The History of the Atomic Theory

  • 384


    Aristotle had believed thet everything is made of four things such as: fire, earth, water, and air. These were also called four elements.
  • 460


    Democritus was a famous greek philosipher and scientist. He believed that all matter cis made up of extremely small particles. he called these things Atoms.
  • John Dalton

    John Dalton
    Dalton had made a theory that atomas were just solid spheres in which they come to gether to build things. He tried thid by using wooden spheres and sticks, connecting them together.
  • Dmitri Mendeleev

    Dmitri Mendeleev
    Mendeleyev had came up with the first design or drawing of the Periodical Table of Element.s
  • Max Planck

    Max Planck
    Max was a German physicist. He is the founder of the Quantum Theory. The quantum theory focuses on the naturee of matter,(atoms.)
  • Hantaro Nagaoka

    Hantaro Nagaoka
    Had came up with the theory that an atom has a nucleus. And the electrons move in orbit around the nucleus.
  • Ernest Rutherford

    Ernst had come to the conclusion that an atom has a dense positively chrged nucleus with the electrons floating randomly around the nucleus itself.
  • Niels Bohr

    Niels Bohr
    Niel had worked with Rutherford for a while but discovered that the electrons in an atom move in spherical orbits around the nucleus.
  • Erwin Schrodinger

    Erwin Schrodinger
    Erwin had developed mathematical equations that describes the motion of an atom. He recieved the Nobel Prize for his work. His work also leads to an electron cloud model.
  • Ernest Marsden

    Ernest Marsden
    Ernest was a New Zeland Phycisist who did a "gold foil experiment." He had used this experiment to determine the derection of alpha particles.
  • James Chadwick

    James Chadwick
    James had confirmed that an atom had electrons but they are not charged.
  • Louis de Broglie

    Louis de Broglie
    Broglie was a French physicist. Broglie had said that moving particles in an atom like electrons Have some properties of waves.
  • J.J. Thomson

    J.J. Thomson
    Thomson had discovered the electron in a series of experiments. such as: using
  • Aristotle