"History of the Atom Timeline by: Tralynn Conner Le'Andre Cole

By LeAndre2017
  • Period: 300 to

    Atoms

  • 340

    Aristotle(340 B.C.)

    Aristotle(340 B.C.)
    Aristotle discovered that stuff can be broken into elements, elements are atoms w/ different masses.
  • 400

    Democritus(400 B.C.)

    Democritus(400 B.C.)
    Democritus claimed that everything is made up of atoms.
    "Democritus Atom." Universe Today RSS. N.p., n.d. Web. 26 Feb. 2014

  • Dalton(1803)

    Dalton(1803)
    He discovered that certain gases only could be combined in certain proportions even if two different compounds shared the same common element or group of elements.

  • Thomson(1897)

    Thomson(1897)
    Took the idea of the atoms and tried to incorporate the evidence for the electrons.

  • Rutherford(1909)

    Rutherford(1909)
    Discovered nucleus most of an atom is empty space.

  • Bohr(1913)

    Bohr(1913)
    Discovered that the Electron can only have a certain energy, difference elements have different energies." A atom absorbs or gives off energy( as in light or heat) the electron jumps to higher or lowe orbits.

  • Heisenburg and Schrodinger(1926)

    Heisenburg and Schrodinger(1926)
    Electrons stuck in their orbits would set up" standing waves," He said that you can describe only the probability of where an electron could be, it was not definite.