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Democritus was a man who beleved that everything is made of matter and can not be seperatred. His theory revolves around the atoms that are present in the atmosphere. This states that atoms are everywhere, in a solid, liquid and gasses.
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He beleved in a couple things like that all matter is made of atoms. Atoms are indivisible and indestructible. Or that all atoms of an element are identical in mass and properties.
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In 1856, J.J Thompson was born to soon to contribute to the atomic theory.