Chapter 4: Atomic Theory Timeline Project 2022

By cwalshaw05
  • 400 BCE

    Democritus

    Democritus
    • Birth/Death: 460 BCE to 370 BCE
    • In 400 BCE, Democritus developed the idea of that the world is made up by small, invisible to the eye atoms.
    • Democritus was known is the "laughing philosopher" because he was a cheerful and calm person.
  • 400 BCE

    Democritus

    Democritus

  • John Dalton

    John Dalton
    • Birth/Death: September 5, 1766 to July 27,1844
    • In 1803, Dalton developed the Ancient Greek idea that an atom is a small, indivisible object that is hard.
    • John Dalton was a Quaker

  • John Dalton

    John Dalton

  • JJ Thomson

    JJ Thomson
    • Joseph John Thomson
    • Birth/Death: December 18, 1856 to August 30, 1940
    • In 1904, JJ Thomson discovered a way to identify different types of atoms using positive rays
    • JJ was born in a suburb of Manchester, England

  • JJ Thomson

    JJ Thomson

  • Robert Milikan

    Robert Milikan
    • Robert Andrews Milikan
    • Birth/Death: March 22, 1868 to December 19, 1953
    • In 1910, Milikan was trying to discover the electrical charge an electron has. He replaces water with oil in some of his later experiments.
    • Later in his life Milikan decided to study radiation.

  • Robert Milikan

    Robert Milikan

  • Ernest Rutherford

    Ernest Rutherford
    • Ernest, Baron Rutherford of Nelson
    • Birth/Death: August 30, 1871- October 19, 1937
    • Rutherford studied radioactivity and started discovering nuclear physics.
    • He was president of the Royal Society from 1925 to 1930.

  • Ernest Rutherford

    Ernest Rutherford

  • Niels Bohr

    Niels Bohr
    • Niels Henrik David Bohr
    • Birth/Death: October 7, 1885 to November 18, 1962
    • In 1913, Neils Bohr was the first to apply the “quantum concept”. The quantum concept revealed that the electron orbits the nucleus
    • Bohr’s father was nominated for the Nobel Prize twice.

  • Neils Bohr

    Neils Bohr

  • Werner Heisenberg

    Werner Heisenberg

  • Werner Heisenberg

    Werner Heisenberg
    • Birth/Death: December 5, 1901 to February 1, 1976
    • Heisenberg is the creator of the theory of quantum mechanics which lead to the discovery of allotropic forms of hydrogen. He also came up with the “principle of uncertainty”
    • He became President of the Alexander von Humboldt Foundation

  • Erwin Schrodinger

    Erwin Schrodinger

  • Erwin Schrodinger

    Erwin Schrodinger
    • Erwin Schrödinger
    • Birth/Death: August 12, 1887 to January 4, 1961
    • Erwin correctly calculated the energy levels in an electron using the formula he created.
    • Schrodinger was born in Vienna.

  • James Chadwick

    James Chadwick

  • James Chadwick

    James Chadwick
    • Birth/Death: October 20, 1891 to July 24, 1974
    • James Chadwick discovered a neutral particle called the neutron that has a similar mass to a proton
    • He was a student under Ernest Rutherford's teachings