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Atom Time Line
Updated: 9/28/2020
Atom Time Line
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Storyboard Text

  • I performed the cold foil experiment overturning Thomasons's model in 1911. The gold foil experiment is where I shot minute particles at a thin gold sheet, some particle went straight through. Others went to the side, and some even were deflected.
  • Hi! I'm John Dolton and I created an atomic theory that stated that all matter is made of atoms, which are indivisible. As well as all atoms are identical in mass and property.
  • To test my hypothesis, I put a piece of beryllium in a vacuum chamber with some polonium. The polonium emitted alpha rays, which struck the beryllium. When struck, the beryllium emitted the mysterious neutral rays.
  • Hey there! I'm J.J. Thomason and in 1897 I created the Cathode Ray Tube (CRT) experiment. The experiment found the negatively charged subatomic particles we call electrons!
  • Heisenberg considered trying to measure the position of an electron with a gamma ray microscope. The high-energy photon used to illuminate the electron would give it a kick, changing its momentum in an uncertain way.
  • In 1911, Rutherford was responsible for a remarkable series of discoveries in the fields of radioactivity and nuclear physics. He discovered alpha and beta rays, set forth the laws of radioactive decay, and identified alpha particles as helium nuclei.
  • Hey there! James Chadwick found the neutron in 1932. The neutron is the neutral subatomic particle in the nucleus. I was awarded the Nobel Peace Prize and helped build the first nuclear bomb for the U.S.A.
  • Bohr was the first to create a theory that electrons travel in separate orbits around the nucleus and that the number of electrons in the outer orbit determines the properties of an element.
  • Heisenberg is best known for his uncertainty principle and theory of quantum mechanics, which he published at the age of twenty-three in 1925. He was awarded the Nobel Prize for Physics in 1932 for his subsequent research and application of this principle.
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