John Dalton and His Atomic Theory

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  • Of course, John. First, he stated that all matter is made of atoms. He thought that atoms were indivisible, solid, and hard. 
  • Mr. Tom, could you please explain to me more about Dalton's atomic theory?
  • The second point in his theory was that all atoms of a given element are identical in mass and properties. 
  • Dalton also stated that compounds are combinations of two or more different types of atoms.
  • That's right!
  • So that means salt is an example of this. Sodium and chlorine combine to a 1:1 ratio and form NaCl, or salt, which we use to season our food.
  • The last point in Dalton's theory was that a chemical reaction is a rearrangement of atoms, and it does not create or destroy atoms.
  • Now, we have learned a lot since since Dalton proposed his theory, so some parts of his theory are incorrect. For instance, we now know that atoms are not indivisible, and that atoms aren't solid or hard, but they are mostly made up of empty space. 
  • Alright, I understand.
  • No problem John, anytime!
  • Thank you for teaching me about Dalton's atomic theory Mr. Tom, because it really does matter.
  • By: Roshna Thomas
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