Atomic History

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Atomic History
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  • Atomic History(Around 400 B.C.E.)
  • I am Democritus, a Greek philosopher who lived in the fifth century BC.
  • Atomic History(1803)
  • I am the English chemist, John Dalton.
  • Atomic History(1897)
  • My name is JJ Thomson.
  • Democritus believed that the atoms differed in size and shape, were in constant motion in a void, collided with each other; and during these collisions, could rebound or stick together. But it was rejected by Aristotle, and the atomic theory was ignored for nearly 2,000 years.
  • Atomic History(1911)
  • Ernest Rutherford is the name for me.
  • Dalton put the pieces of the puzzle together and developed an atomic theory in 1803. It was generally accepted because it explained the laws of conservation of mass, definite proportions, multiple proportions, and other observations.
  • Atomic History(1913)
  • JJ Thomson used a model called the plum pudding model. He found out that an atom is electrically neutral, it consists of a positive and negative charge, and negatively charged electrons are fixed in the positive sphere..
  • Atomic History(1926)
  • Who are you?
  • Ernest Rutherford used a model called the nuclear model. He found out that atoms are mainly empty space and electrons are located outside the nucleus.
  • Niels Bohr used experiments to support the idea that electrons occupy particular orbits or shells around the nucleus of an atom.
  • Niels Bohr
  • Erwin Schrodinger used the quantum mechanical model. He found out that electrons don’t move around the nucleus.
  • The name is Erwin Schrodinger.
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