Oh, what a lovely question! Aristotle did not actually propose an atomic theory himself. It was his student Democritus who first introduced the idea of atoms as the building blocks of matter. Aristotle, with his deep wisdom and understanding, contributed to many other areas of philosophy and science.
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In 328 BCE, Aristotle believed that all matter was made of water, air, fire, and earth.
He did not necessarily discover the atom but helped further the theory of atoms.
In the 4th century BC. Leucippus is considered the founder of the atomic theory, though no dates are known for sure. In fact some believe he did not exist at all.