History of Atoms

History of Atoms
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  • Democritus believed that matter was made of small, solid objects that couldn't be divided, created, or destroyed. Aristotle, another man from Democritus's time, didn't agree with Democritus. He believed all matter was made of the four elements: water, fire, air, and Earth.
  • I think matter is made up of these little things we call atomos. They can't be divided or created or destroyed.
  • That's absurd! Matter is made of the four elements: fire, water, Earth, and air!
  • John Dalton agreed with Democritus. He also believed matter was made of small, solid objects that couldn't be divided, created, or destroyed. He also created Dalton's Atomic Model, a solid sphere.
  • Y'know, I think Democritus was right. Matter is made up of atoms!
  • J.J. Thomson conducted the Cathode Rays Experiment, and discovered that the cathode ray bent towards a positive place. He also discovered electrons, and created the Thomson Atomic Model
  • My experiment shows that opposites attract!
  • Ernest Rutherford conducted the Gold Foil Experiment, and concluded that because some of the particles in the beam bounced back, atoms must have a positively charged center, and must have empty space between them. He discovered the nucleus and protons and created the Rutherford Model.
  • If some of those particle beams bounce off...that must mean that atoms have a positively charged center!
  • James Chadwick discovered that the nucleus also contains neutrally charged neutrons. Niels Bohr said that electrons move in circular orbits around the nucleus. He also said that the electron rings had energy levels. He also created the Bohr Model.
  • The electrons around the nucleus must move in some sort of orbit.
  • I just want to add that there are these neutrally charged things in the nucleus call neutrons. 
  • Erwin Schrodinger stated that electrons do not move in specific paths, but in waves. He also found the electron cloud.
  • Electrons don't move in set paths!
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