• A model gives an idea of what something looks like, but is not the real thing.
  • J.J. Thomson developed what became known as the "plum pudding" model of the atom in 1904.
  • In Thomson's model, the electrons were embedded in a uniform sphere of positive charge like blueberries stuck into a muffin.
  • The goal of each atomic model was to accurately represent all of the experimental evidence about atoms in the simplest way possible.
  • The electron was discovered by J. j. Thomson in 1897, and the existence of protons was also known.
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