The ideas of these two men (Democritus and Leucippus) were discredited by Aristotle, and the result on the progress of atomic theory for the next 2,000 years was that his views held sway through Middle Ages.
Democritus and Leucippus suggested that if matter is examined at smaller scale, ultimately individuals atoms-objects that cannot be further divided are observed. Aristotle, who was a Greek philosopher and polymath during Classical period in Ancient Greek, discredited the theory suggested by the two men. Aristotle disagreed with the atomic theory, and he taught so. He believed that all materials on Earth did not comprise of atoms, rather the four elements, earth, fire, water, and air. His opinion held sway through the Middle Ages which influenced the progress of atomic theory for the next 2000 years.
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