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xXMissFurious27Xx
  • The first part of his theory states that all matter is made of atoms, which are indivisible.
  • The second part of the theory says all atoms of a given element are identical in mass and properties.
  • The third part says compounds are combinations of two or more different types of atoms.
  • The fourth part of the theory states that a chemical reaction is a rearrangement of atoms.
  • Parts of the theory had to be modified based on the discovery of subatomic particles and isotopes.

I hope it's helpful!!