Development of the Atomic Theory


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  • Good morning, class! Today, we will be learning the development of the atomic theory. We will also tackle the discovery of certain particles that compose the atom.
  • In 430 BC, Democritus developed an atomic theory which states that all matter is composed of indivisible particles called "atomos"
  • Unlike my rival, Aristotle, who says all matter is made up of earth, water fire and air!
  • Yes yes, atoms are like building blocks of matter. They are small, indivisible and indestructible! Atoms look like a single ball of mass.
  • After roughly 2000 years, John Dalton proposed the "Ball Model" after some experiments.
  • Eugen Goldstein conducted an experiment with hydrogen gas and a CRT similar to Thomson. Some particles passed through the perforated circle which had a positive charge.
  • What are these particles that passed through?
  • I did this with my trusty Cathode Ray Tube. Remember: I call the negative particles "corpuscles"
  • In 1897, J.J. Thomson concluded that atoms were negatively charged particles stuck to a large positive particle. This model was called the Plum Pudding Model.
  • Soon after, in 1911, Ernest Rutherford conducted an experiment with a gold foil and gamma rays. After which, he proposed the "Nuclear Model".
  • Some rays passed through and some came back! I conclude that in an atom there is empty space and the electrons float like a cloud around the "Nucleus".
  • He also coined the term "proton"
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