Atomic Theory Project

By prickly_pineapple
  • 460 BCE

    The origination of the theory

    The origination of the theory
    Philosopher Democritus suggested that matter couldn't be infinitely divided. He also theorized "atoms" as very small, indivisible, solid particles that're surrounded by empty space.
  • 300 BCE

    Rejection of The Atom

    Rejection of The Atom
    Aristotle rejected Democritus atom idea, and instead, believed that matter consisted of 5 basic elements, earth, water, air, fire and ether. Due to his popularity, his idea prevailed for almost 2000 years.

  • Rise of the Atomic Theory

    Rise of the Atomic Theory
    John Dalton suggested that atoms could be the reason why elements come together in specific ratios to form compounds. With evidence, Dalton backed up his claim, and thus, the atomic theory emerged.

  • Atomic Model 1

    Atomic Model 1
    John Dalton proposes the atom as an indivisible unit of an element, creating the solid sphere model.

  • Emperiment 1

    Emperiment 1
    JJ Thomson used a cathode ray to determine that atoms were made of smaller charged particles, protons being positive and electrons being negative.

  • Contribution 1

    Contribution 1
    Max Planck created the quantam theory, stating that energy isn't emitted or absorbed continuously, but in packets called "quanta," meaning specifc amounts.

  • Atomic Model 2

    Atomic Model 2
    Thomson also suggested that the atomic model was like a plum pudding, the electrons and protons randomly in the atom.

  • Contribution 2

    Contribution 2
    Albert Einstein expanded the idea of "quanta" by proposing that light itself can be considered as particles called photons.

  • Expiriment 2

    Expiriment 2
    Ernest Rutherford shot radiation at gold foil, and from the angles of refraction, said that the center of an atom was mostly mass and positive charges.

  • Atomic Model 3

    Atomic Model 3
    Rutherford created his version of the atomic theory, which includes a nucleus.

  • Atomic Model 4

    Atomic Model 4
    Niels Bohr used light from atoms to determine that electrons moved around the nucleus in fixed orbits, called the planetary model.

  • Atomic Model 5

    Atomic Model 5
    Erwin Schrodinger made the development of the Schrodinger equation, a math model that described electrons as waves and calculated the probability of finding an electron in a specific space within an atom.

  • Atomic Model 6

    Atomic Model 6
    Werner Heisenberg created the uncertainty principle, aka the indeterminacy principle. It states that the position and momentum of a particle can't be known precisely at the same time.

  • Atomic Model 7

    Atomic Model 7
    James Chadwick made the discovery of the neutron, a neutral particle that's in the nucleus of an atom with protons.