Atomic Model 2.0

  • 400


    Democritus believed that all matter consisted of small particles that couldn't be divided. He talked about his theory making others believe his theory was right.
  • 401


    Aristotle beleived all substances were built from four elements: fire,water,earth, and air. Created a diagram showing the elements and hot,cold,dry, and wet.
  • John Dalton

    John Dalton
    His theory said all elements are composed of atoms. Also all atoms of the same element have the same mass, and atoms of different elements have different masses. Created spheres to illustrate what atoms looked like.
  • Joseph Thomson

    Joseph Thomson
    Thomson used electric current to study atoms. He hypothesized that a beam has a stream of particles that interact with the air in the tube he created. Some refer to his model as the "plum pudding." Model showed that the negaitve and positive charges are balanced.
  • Niels Bohr

    Niels Bohr
    His theory was that electrons move with constant speed in fixed orbits around the nucleus. He drew a atom with electrons orbiting it.
  • Hantoro Nagaoka

    Hantoro Nagaoka
    He suggests that an atom has a central nucleus. Electrons orbit this center nucleus. Drew a diagram of his theory.
  • Robert Millikan

    Robert Millikan
    Determined the unit charge of an electron in 1909 with his oil drop experiment. e = 1.60 x 10-19.
  • Ernest Rutherford

    Ernest Rutherford
    He discovered that uranium emits fast moving particles that have a positive charge. With help from Marsden he shot a beam of light at a gold piece to see where light travels first.
  • Albert Einstein

    Albert Einstein
    Came up with the equation E=mc2. E represents energy, m represents mass, and c² is the square of the speed of light.
  • Erwin Schrodinger

    Erwin Schrodinger
    Used mathmatical equations to describe the movement of electrons. His model was made into an electron cloud.
  • Ernest Marsden

    Ernest Marsden
    Helped with Rutherfords theory and model. He was one of Rutherfords students. He helped with the gold piece and beam of light model.
  • James Chadwick

    James Chadwick
    He confirmed there are neutrons. Neutrons stabalized the repeal of the positive protons.
  • Louis de Brogile

    Louis de Brogile
    Said moving particles such as electrons have some properties of waves. He tested his theory by shooting electrons at nickle.