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History of the Atom!

History of the Atom!. Roman Dymkevitch Block 2 Honors. Democritus 460 B.C. Came up with the idea that atoms were indestructible and indivisible. Thought atoms were a ball and the smallest piece of matter. Dalton 1803.

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History of the Atom!

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  1. History of the Atom! Roman Dymkevitch Block 2 Honors

  2. Democritus460 B.C. • Came up with the idea that atoms were indestructible and indivisible. • Thought atoms were a ball and the smallest piece of matter.

  3. Dalton1803 • Through experiments, Dalton realized that each element has one specific atom. • Atoms of different elements are different from each other.

  4. Mendeleev1869 • He invented the first periodic table. • He predicted the properties of undiscovered elements.

  5. Eugene Goldstein1885 • Discovered that atoms have positively charged particles. • He used the cathode-ray tube experiment to discover this.

  6. Henry Becquerel1896 • Henry discovered that magnetic fields can deflect x-rays. • He also discovered radioactivity and was awarded the Nobel Prize in 1903.

  7. J.J. Thomson1897 • First to use cathode ray experiment. • Discovered atoms have negatively charged particle. • Came up with the following atom model.

  8. Ernest Rutherford1907 • First to use gold-foil experiment. • Discovered that atoms are mostly empty space and that they have a nucleus. • Proved J.J. Thomson’s atom model is incorrect.

  9. Millikan1910 • Determined through experiment that electrons carry the negative charge in an atom. • Used J.J. Thomson’s ratio the find the mass of electrons.

  10. Niels Bohr 1913 • Bohr invented another model of the atom. • It involves a positive nucleus with negative orbiting electrons in different energy levels.

  11. Frederick Soddy1913 • Studied radioactive substances with Rutherford. • Discovered that radioactive elements emitting alpha and beta particles change into elements with different chemical properties.

  12. Heisenberg1925 • He developed quantum mechanics. • He also stated the uncertainty principle.

  13. Chadwick1932 • James Chadwick discovered the subatomic particle: neutrons. • Neutrons have a neutral charge.

  14. Sources (Pictures) Slide 2 http://reich-chemistry.wikispaces.com/file/view/Dalton%27s_Model.jpg/282291300/Dalton%27s_Model.jpg Slide 3 http://www.chelationtherapyonline.com/technical/images/chembond_atom3.jpg Slide 4 http://www.msnucleus.org/membership/html/jh/physical/periodictable/images/MendeleevPeriodic.gif Slide 5 http://chemed.chem.purdue.edu/genchem/history/gifs/figu6_6b.gif Slide 6 http://www.accessexcellence.org/AE/AEC/CC/images/becquerel.460.gif Slide 7 http://im.glogster.com/media/1/6/41/16/6411689.jpg Slide 8 http://www.daviddarling.info/images/Rutherford_gold-foil_experiment.jpg Slide 9 http://awaismasood.files.wordpress.com/2009/04/electron.jpg Slide 10 http://3.bp.blogspot.com/_DZbDcIFlgfo/TLz1ufvQ5iI/AAAAAAAAABU/3KH2cOMEO10/s1600/bohrs_model.gif Slide 11 http://theintelhub.com/wp-content/uploads/2010/08/radiation11254496251.jpg Slide 12 http://library.thinkquest.org/15567/bio/heisenberg.jpg Slide 13 http://www.aps.org/publications/apsnews/200705/images/chadwick_web.jpg

  15. Sources (Information) Slide 4 http://www.chemistry.co.nz/mendeleev.htm Slides 2 3 7 8 9 class notes Slide 5 http://www.visionlearning.com/library/module_viewer.php?mid=50 http://chemed.chem.purdue.edu/genchem/history/goldstein.html Slide 6 http://www.accessexcellence.org/AE/AEC/CC/historical_background.php Slide 10 http://chemistry.about.com/od/atomicstructure/a/bohr-model.htm Slide 11 http://abyss.uoregon.edu/~js/glossary/atomic_theory.html Slide 12 http://library.thinkquest.org/15567/bio/heisenberg.html Slide 13 http://www.syvum.com/cgi/online/serve.cgi/squizzes/chem/atomic1.html

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