Atomic History

By Wlw2110
  • Period: 300 to

    Atomic History

  • 400

    Democritus

    Everything is composed of atoms
  • Aug 3, 1492

    Columbus's voyage

  • Dalton

    He proposed the atomic theory with spherical solid atoms. He said that the forces of repulsion thought to cause pressure acted only between the same type of atom and that the atoms In a mixture were different in weight and complexity

  • lavoisier

    Law of Conservation. matter can't be made or destroyed. Matter rearranged, but never disappeared.

  • Revolutionary war start

  • Avogrado

    Equal volume of gas as at the same temperature and pressure have equal number of molecules.

  • Berzelius

    created the periodic table system we use to identify elements. Used first letter of elements name in Latin.

  • Revolutionary war end

  • Civil war start

  • Civil war end

  • J.j. Thomson

    J.j. Thomson
    Discovered electrons and noticed that an atom can be divided. He made the Plum Pudding Model.

  • Planck

    He used the idea of “quanta” to explain hot glowing matter

  • Millikan

    He used the oil drop experiment to determine the charge of an electron/negative charge.

  • Rutherford

    disintegration theory with atoms. Atoms have tiny,heavy nucleus.

  • Sinking of the titanic

  • Moseley

    he proved that every element’s identity is determined by the number of protons it has. He discovered 4 new chemical elements

  • Bohr

    Bohr
    Explained the spectrum of atomic hydrogen by using the description of Rutherford’s atom.

  • World war 1 start

  • Curie, M

    Developed methods to separate radium from radioactive resides.Determined the atomic weight of radium to be 255.

  • World war 1 end

  • Heisenberg

    Matrix mechanics. Uncertainty principle-electrons don't travel in neat orbits. All electrons contain photons.

  • Schrodinger

    Quantum mechanic atomic model does not show exact path of electron but predicts the odds of the location of the electron

  • Chadwick

    Chadwick
    he bombarded beryllium atoms with alpha particles. Found the neutron to have a neutral electrical charge and the same mass of the atoms protons.

  • World war 2 start

  • World war 2 end

  • Mom birth

  • Dads birth

  • My birth

  • Aristotle

    Did not believe in the atomic theory
    He thought that all Earth materials weren’t made of atoms but of the four elements Earth, Wind, Water, and Fire.