Joseph John Thompson

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Joseph JohnThompson
By Cory Bair, Nick Nyce, Nick Shizzle
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History

• In 1987 he discovered the electron in a series of
  experiments. These experiments were to study the
  electrons discharge in a high-vacuum cathode ray
  tube.

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Theory

• The particle inside a positive charged matter
  were negative. He called these particles
  electrons.

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Helpful Theories

• Daltons-Daltons theory helped out because it
  stated that all elements are made up of atoms
• Thomsons helped Rutherfords theory because it
  helped him with more experimentation. Rutherford
  found that Thomson was initially wrong.

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Theories-Experiments

• Rutherford performed many experiments with
  radioactive alpha particles.
• Rutherford created the atom.
• J.J. Thomson created the electron
• Thomson found that the mysterious glowing stream
  would bend toward a positively charged electric
  plate.
• Thomson theorized, and was later proven correct,
  that the stream was in fact made up of small
  particles, pieces of atoms that carried a
  negative charge. These particles were later named
  electrons.

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Rutherford

• Rutherford proposed a revolutionary view of the
  atom. He suggested that the atom consisted of a
  small, dense core of positively charged particles
  in the center (or nucleus) of the atom,
  surrounded by a swirling ring of electrons.
• The nucleus was so dense that the alpha particles
  would bounce off of it, but the electrons were so
  tiny, and spread out at such great distances,
  that the alpha particles would pass right through
  this area of the atom.

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Rutherfords Example

• Gold Foil
• The atom resembled a tiny solar system with the
  positively charged nucleus always at the center
  and the electrons revolving around the nucleus.

                                                         
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Electrons

• Thomson discovered electrons from his work with a
  nineteenth century scientific curiosity the
  cathode ray tube.

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Atoms

• Atoms are very small.
• Atom contains one Electron, Proton, Neutron.
• Atoms of different elements are characterized by
  their number of protons.
• The number of protons are constant for all atoms
  of a single element the number of neutrons
• and electrons can vary

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Works Cited

• http//www.visionlearning.com/library/module_viewe
  r.php?mid50