History of the Atom Timeline by (Kade Riche and Paola Granados)

By kadeandpaola
  • 465

    Democritus

    Democritus
    "The universe is composed of two elements: the atoms and the void in which they exist and move."https://the-history-of-the-atom.wikispaces.com/Democritus. Democritus' theory was adopted from his mentor, Leucippus. Democritus thinked the atom was invisible, solid, could not be destroyed, and was homogenous. His model had no electrons, protons, or neutrons.

  • Dalton

    Dalton
    All matter is made up of atoms. Atoms are invisable and indistructible. All atoms of a given element are indenticle in mas and properties. Compounds are formed by combination of two or more diffrent kinds of atoms. He believed a chemical reaction was just a rearrangment of atoms. " A series of experiements which would cluminate in him proposing the theory of atomic compositions." He called his theory, Dalton's Law of Partical Pressures."John Dalton's Atomic Model." Universe Today. N.p., 01 Dec

  • Thomson

    Thomson
    Thomson discovered the electron. He discovered this by "...using Crookes, or cathode ray, tube." The tubes were negitive charged. "Thomson held that atoms are uniform spheres of positively charged matter which electrons are embedded." "Thomson Atomic Model." Encyclopedia Britannica Online. Encyclopedia Britannica, n.d. Web. 25 Feb. 2015.

  • Rutherford

    Rutherford
    Ernest Rutherford discovered the nucleus of the atom in 1911 Rutherford announced the discovery of the nuclleus of an atom. The method that he used was that he would shot particles into a gold board and try to see what would happen.Rutherford pictured the atom with small electrons that carried a positive particle. "Alpha Particles and the Atom." Rutherford's Nuclear World: The Story of the Discovery of the Nucleus | Sections | American Institute of Physics. N.p., n.d. Web. 26 Feb. 2015.

  • Bohr

    Bohr
    In 1913 Bohr proposed his quantized shell model of the atom to explain how electrons can have stable orbits around the nucleus.
    He used h = 6.6x10-34 joule seconds which was Planks constant, How Bohr pictured the atom was by nucleus with electrons floating randomly . in the model the nucleus occupies a dense central region and the electrons orbit the nucleus at discrete distances much like planets orbiting the Sun. http://chemed.chem.purdue.edu/genchem/history/bohr.html

  • Heisenberg and Schrodinger

    Heisenberg and Schrodinger
    Both Heisenberg and Schrodinger had invented the new quantum theory of physics. The name of the method was wave function. They tough the description of the atom supported Bohr's atomic model, with the electron existing as a particle. "CERN Accelerating Science." Erwin Schrödinger and Werner Heisenberg Devise a Quantum Theory. N.p., n.d. Web. 26 Feb. 2015.