Atomic Theory Part 1

Atomic Theory Part 1
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  • Democritus was born in 460 BC in the city of Abdera, Thrace. He watched stones being cut in half and thought about how small they could go. He then came up with the idea of the atom.
  • This sphere is what an atom looks like
  • Democritus thought that atoms could not be divided any further, they make up everything, there is an infinite number of them, they are always moving and that there is space in between them. His theory was rejected by Aristotle which caused it to lose credibility. He died in 360 BC.
  • What do you mean? You're going to make me lose all credibility
  • WRONG!
  • James Dalton was born on September 6th, 1766 in Eaglesfield, UK. In the year 1803, James expanded upon the ideas the Democritus had put forth. He said that atoms combine in small whole-number ratio and that when elements are combined that they combine in more than one whole-number ratio. He died on July 27th, 1844
  • H
  • O
  • H
  • Now, this is what an atom looks like.
  • J.J. Thomson was born on December 18th, 1856 in Cheetman Hill, Manchester. In the year 1897, he was experimenting with a cathode ray when he discovered that atoms have electrons which he thought were only negatively charged. He then made an atomic model that had a positive atom with negative electrons inside of it. He died on August 30th, 1940.
  • This atom thing is really weird
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  • Robert Millikan was born on March 22nd, 1868 in Morrison, Illinois. He performed an experiment that showed and measured the electric charge of electrons. He died on August 30th, 1953.
  • This electron thing has an electrical charge!
  • Ernest Rutherford was born on August 30th, 1871 in Brightwater, New Zealand. When he was experimenting with alpha particles in 1911, he discovered that atoms had a nucleus which is the center of the atom. He died on October 19th, 1937.
  • I wonder how many other things there are in atoms that we do not know about?
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