A brief presentation on the history of the atom. 1800 Dalton: “Matter indeed, seems to consist of elementary lumpy particles” 18001897 1900 1905 1911.

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Presentation transcript:

A brief presentation on the history of the atom

1800 Dalton: “Matter indeed, seems to consist of elementary lumpy particles”

1897 J.J. Thomson: Discovered the electron and proposed a model for the structure of the atom: “Rasin in the pudding” He knew that e - had negative charge

1900 Max Planck: When you vibrate atoms strong enough, you can measure the energy only in discrete units (quanta)

1905 Albert Einstein: Light absorption can release e - from atoms. “The Photoelectric effect” (Nobel Prize 1921)

1911 Ernest Rutherford: Bombarded atoms with α ++. He came up with a new theory about the structure od the atom: “Solar System” like Problems: Loss of energy, continuous spectrum expercted

1912 Niels Bohr: Introduced “Rules” 1. Allowed Orbits 2. Jump from Higher Energy orbit to Lower Energy orbit results to energy emission

1920 Bohr – Sommerfeld: Expanded the initial rules: Orbits of different shapes (Quantum Numbers)

1924 Wolfgang – Pauli: Electron spin, “Pauli’s exclusion principle”

1926 Erwin Schrodinger: “Why not try to form a model for particle- waves”

1927 Werner Heisenberg: “Heisenberg’s uncertainty principle”

James Chadwik: Discovery of the neutron Carl Anderson: Discovered the positron, which Dirac had predicted in 1928 but was rejected at first Heisenberg: Particles exchange photons

1935 Hideki Yukawa: Exchange particles for strong force

1940 Feynman, Schwinger: Four known forces, particles

Source Compiled by Jim Walker Presentation made by: Tsourlidaki Eleftheria