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Thomson's Plum Pudding Model

Eleanor Froula, Wilson Coger, Shail Patel

What was the Plum Pudding Model?

  • The atom is made up of a large, positively charged cloud, while the electrons are small negatively charged balls.

Education

The Plum Pudding Model

  • He enrolled in Owen's College (now the University of Manchester) at the age of 14
  • In 1876 he obtained a scholarship at Trinity College, or Cambridge
  • Received a B.A. in mathematics in 1880
  • Studied at the Cavendish laboratory

Discovery of the Electron

  • Designed an experiment to study the nature of electric discharge in a high-vaccum cathode-ray tube
  • Interpreted deflection of rays by electrically charged plates and magnets as evidence of electrons
  • Estimated the number of electrons in an atom from measurements of the scattering of light, X, beta, and gamma rays
  • Found that they had little mass

Who was JJ Thomson?

Collaborators

  • Lord Kelvin made the Plum Pudding Model in 1900 but JJ supported it and brought it to prominence

Sources

Joseph John "JJ" Thompson. (2017, January 18). Retrieved

September 14, 2017, from https://www.chemheritage.org/historical-profile/joseph-john-j-j-thomson

Modern Atomic Theory: Models. (n.d.). Retrieved September 14,

2017, from http://www.abcte.org/files/previews/chemistry/s1_p5.html

The Early Atom. (n.d.). Retrieved September 14, 2017, from

https://courses.lumenlearning.com/boundless-physics/chapter/the-early-atom/

The Editors of Encyclopædia Britannica. (2013, December 27).

Thomson atomic model. Retrieved September 14, 2017, from https://www.britannica.com/science/Thomson-atomic-model

Conclusion about Atom

  • Atoms could eject, or kick out, an electron
  • Electrons are scattered unevenly across a soup of positive charge

Discovery of the Electron

  • Discovered the electron in 1897
  • Served as the basis for the Plum Pudding Model
  • Knew that atoms had a neutral charge naturally, so using previous knowledge, he discovered the electrons
  • He also studied positively charged particles in neon gas

Conclusion

Disproving Dalton

  • Disproved Dalton's Billiard Ball model by concluding that an atom was not indeed just one solid ball
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