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Period: 1 BCE to
Democritus
The theory of Democritus was held that everything is composed of “atoms” which are physically but not geometrically indivisible. Atoms are in continues motion and all the atoms are different shape and size. -
Period: 1 BCE to 2016 BCE
Aristotle
Aristotle famously rejected Plato's theory of forms, which states that properties such as beauty are abstract universal entities that exist independent of the objects themselves. Instead, he argued that forms are intrinsic to the objects and cannot exist apart from them, and so must be studied in relation to them. -
Period: 1 BCE to 2016 BCE
John Dalton
Although two centuries old, Dalton's atomic theory remains valid in modern chemical thought. All matter is made of atoms. Atoms are indivisible and indestructible. Compounds are formed by a combination of two or more different kinds of atoms.