the history of an atom
Katelyn Miller
Atoms Blog
History of an Atom
Democritus, a Greek philosopher, was thought to be the first person to use the term atom in 400 BC. He hypothesized that if you take a piece of matter and divide it and continue to divide it you will eventually come to a point where you could not divide it any more. This fundamental or basic unit was what Democritus called an atom. This is called the theory of the universe. This created the basic facts we know today. That all matter is made of atoms, atoms are completely solid, and that atoms vary between substances. Later in the 1800’s, John Dalton created an atomic model using the theory of the universe. He hypothesized that atoms are indestructible and unchangeable.
In the late 1890’s is when J.J. Thompson was then credited for discovering the electron and and then used his research on the cathode ray tube. An electric charge is passed through the tube. The charge is invisible, so to see where it traveled a fluorescent screen is placed at back of tube. Thomson showed that the charge would deflect away from the negative coil. He then stated that this charge had to be a negative charge. Ernest Rutherford was not convinced by the model proposed by Thomson. Rutherford stated that the atom was like a mini solar system and that the electrons circled the nucleus in a wide orbit.
In 1920’s Erwin Schrödinger was a revolutionary physicist who used Heisenberg’s uncertainty principle to come up with the atomic model that we still use today. He theorized that an electron does not travel in an exact orbit.
https://courses.lumenlearning.com/trident-boundless-chemistry/chapter/history-of-atomic-structure/
In the late 1890’s is when J.J. Thompson was then credited for discovering the electron and and then used his research on the cathode ray tube. An electric charge is passed through the tube. The charge is invisible, so to see where it traveled a fluorescent screen is placed at back of tube. Thomson showed that the charge would deflect away from the negative coil. He then stated that this charge had to be a negative charge. Ernest Rutherford was not convinced by the model proposed by Thomson. Rutherford stated that the atom was like a mini solar system and that the electrons circled the nucleus in a wide orbit.
In 1920’s Erwin Schrödinger was a revolutionary physicist who used Heisenberg’s uncertainty principle to come up with the atomic model that we still use today. He theorized that an electron does not travel in an exact orbit.
https://courses.lumenlearning.com/trident-boundless-chemistry/chapter/history-of-atomic-structure/
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