Chemist: Democritus
Contribution: The Democritus Atom Model
The ancient Greek philosopher Democritus was of the first to develop an atomic theory, and in fact believed that everything is made of atoms which cannot be physically divided and are always in motion. He believed atoms exhibited the physical traits of the compounds they sustained, so an atom's shape might be hooked, sharp, pointed, slippery, or smooth depending on how it behaved in its extended existence.
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Information Credits: Universe Today