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atomic model

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kori johnson

on 12 December 2012

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Transcript of atomic model

CONTRIBUTORS atomic model Democritus
1 Jan 460 Max Planck
1 Jan 1900 Hantaro Nagaoka
1 Jan 1903 Albert Einstein 1905 abegg 1904 Hans Geiger 1906 H.G.J Moseley 1914
460 BCGreeceHe developed the idea of atoms. He thought that at some point, a substance wouldn’t be able to be split in half anymore and he called these basic matter particles ‘atoms’. Without this idea of atoms, none of the discoveries of atoms or elements would have been made since they didn’t have a base to work on
1900GermanyHe developed the Quantum theory. He attempted to draw conclusions from the heat radiation to the radiating atom.The discovery of quanta changed the idea of physics, because it showed that established ideas about the nature of radiation and energy were wrong 1903JapanHe was the first scientist to present a Saturnian model of an atom. The model displayed a nucleus containing positive electric charge and electrons ‘orbiting’ it. It gave us an idea of what an atom looked like, making it easier to understand the structure of it Discovered that inert gases had a stable electron configuration which lead to their chemical inactivity. Published the famous equation e= mc2 Developed an electrical device to "click" when hit with alpha particles. Using x-ray tubes, determined the charges on the nuclei of most atoms. He wrote"The atomic number of an element is equal to the number of protons in the nucleus". This work was used to reorganize the periodic table based upon atomic number instead of atomic mass. 1919 Aston
Discovered the existence of isotopes through the use of a mass spectrograph. 1922 niel bohr Developed an explanation of atomic structure that underlies regularities of the periodic table of elements. His atomic model had atoms built up of sucessive orbital shells of electrons. 1930 Paul Dirac

Proposed anti-particles . Anderson discovered the anti-electron (positron) in 1932 and Segre/Chamberlain detected the anti-proton . 1932 James Chadwick Using alpha particles discovered a neutral atomic particle with a mass close to a proton. Thus was discovered the neutron. 1941 - 51 Glenn Seaborg Synthesized 6 trans uranium elements and suggested a change in the layout of the periodic table. THE END
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