a brief presentation on the history of the atom. 1800 dalton: “matter indeed, seems to consist of...
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A brief presentation on the history of the atom
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1800
Dalton: “Matter indeed, seems to consist of elementary lumpy
particles”
1800 1897 1900 1905 1911 1912 1920 1924 1926 1927 1935 19401932
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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
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1900
Max Planck: When you vibrate atoms strong enough, you can measure the energy only in discrete units (quanta).
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1905
Albert Einstein: Light absorption can release e- from atoms.“The Photoelectric effect”
(Nobel Prize 1921)
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1911
Ernest Rutherford: Bombarded atoms with α++. He came up with a new theory about the structure od
the atom: “Solar System” likeProblems: Loss of energy,
continuous spectrum expercted.
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1912
Niels Bohr: Introduced “Rules”1. Allowed Orbits2. Jump from Higher Energy orbit to Lower Energy orbit results to energy emission.
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1920
Bohr – Sommerfeld: Expanded the initial rules:
Orbits of different shapes (Quantum Numbers)
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1924
Wolfgang – Pauli: Electron spin, “Pauli’s exclusion principle”
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1926
Erwin Schrodinger: “Why not try to form a model for particle-
waves”
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1927
Werner Heisenberg: “Heisenberg’s uncertainty
principle”
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1932
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
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1935
Hideki Yukawa: Exchange particles for strong force
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1940
Feynman, Schwinger: Four known forces, particles
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Source
• http://www.nobeliefs.com/atom.htm
Compiled by Jim Walker
• Presentation made by:
Tsourlidaki Eleftheria