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Leucippus (440-430 BCE)

Leucippus was born in the first half of the 5th century BCE in Greece. His exact dates of birth and death are not known. All that is known is that he lived in the 5th century CE. While not much is known about Leucippus, it is known that he was the developer of atomism.(Thebigview.com) Most of leucippus' theories were established by a later scientist, Democritus. Between 440 BCE and 430 BCE, luccippus developed a school in Abdera where he met Democritus. It is difficult for historians to determine what Leucippus descovered and what Democritus discovered. Even though not much is known about Leucippus' life and other studies, it is certain that he developed the fundamental idea of the atom, which was the reason for the further exploration of the atom.

Democritus (Somewhere between 494-404 BCE, exact date of discovery not known)

Democritis was born in Greece in a town called Abdera, located on the coast of the Aeagean Sea in 494 BCE. he worked closely with Leucippus, with Leucippus being his mentor. Before he died in 404 BCE he was a leader in the chemistry world.

He is very important in the history of the atom becasue he introduced the concept of the atom. Although Leucippus was the first to come up with the concept Democritus came up with the atomic theory which put the idea into form. Democritis worked with Leucippus to completely overturn everything that the science world believed in. They came up with the terms which are still used today. (thebigview.com)

Aristotle

Aristotle was born in 384 BCE. he was a student of Plato and a teacher to Alexander the Great. He helped further a lot of things in science. As well as adding to the chemistry and physical world he founded a way of classifying animal. He died in 322 BCE.

He did not like the idea that atoms were the smallest thing n the universe. He believed that nothing was smaller than the things that made up the natural element, earth, water and fire. Although we know that this is true now, people then believed him over Leucippus and Democritis just becasue of his popularity.