jan 1, 1803 - John Dalton

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1-Everything is composed of atoms, which are the indivisible building blocks of matter and cannot be destroyed.

2-All atoms of an element are identical.

3-The atoms of different elements vary in size and mass.

4-Compounds are produced through different whole-number combinations of atoms.

5-A chemical reaction results in the rearrangement of atoms in the reactant and product compounds.

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