Atomic Theory

By Braden8844
  • 460 BCE

    400 B.C.

    400 B.C.
    Democritus born circa 460 BCE died 370 BCE. Theorized that atoms were specific to the material which they composed. Ancient greek natural philosopher.
  • Period: 450 BCE to

    450 B.C.E. - 1932

  • 1808

    1808
    John Dalton September 6, 1766- July 27, 1844 he thought all matter was made of atoms which are invisible, all other atoms are given identical in mass and properties he worked as a teacher in college

  • 1897

    1897
    Joseph John Thompson, December 18, 1856 - August 30, 1920. Helped revolutionized the knowledge of atomic structure by his discovery of the electron. Was knighted in 1908. received the royal and Hughes medals 1894 and 1902

  • 1908

    1908
    Ernest Rutherford, August 30, 1871 - October 19, 1937. Responsible for a remarkable series of discoveries in the fields of radioactivity and nuclear physics. In 1899, demonstrated that there are two types of radiation: alpha radiation and beta radiation

  • 1913

    1913
    Niels Hendrick David Bohr, October 7, 1885 - November 18, 1962. one of the foremost scientists of modern physics, best known for his substantial contributions to quantum theory and his Nobel Prize-winning research on the structure of atoms. Well known for setting off explosions in his university's lab.

  • 1913

    1913
    Robert Andrews Millikan, March 22, 1868 - December 19, 1953. discovered the elementary charge of an electron using the oil-drop experiment. Millikan was an enthusiastic tennis player, and golf was also one of his recreations

  • 1926

    1926
    Erwin Rudolf Josef Alexander Schrodinger, August 12, 1887 - January 4, 1961. Austrian theoretical physicist who contributed to the wave theory of matter and to other fundamentals of quantum mechanics. awarded the Nobel Prize for physics in 1933 for his work on what is known as the Schrodinger equation.

  • 1927

    1927
    Werner Karl Heisenberg, December 5, 1901 - February 1, 1976. proton and neutron interaction. As a child, he played the piano and had a remarkable ability to play complex compositions despite his youth and relative inexperience.

  • 1932

    1932
    James Chadwick, October 20, 1891 - July 24, 1974. he proved the existence of neutrons – elementary particles devoid of any electrical charge. In 1927 he was elected a fellow at the royal society.