jan 1, 400 BC - Democritus

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Democritus was the first scientist to create a model of the atom. He was the first one to discover that all matter is made up of invisible particles called atoms. He created the name "atom" from the Greek word "atomos", which means uncuttable. He also discovered that atoms are solid, insdestructable, and unique. His model was just a round solid ball. Democritus didn't know about a nucleus or electrons, all he knew was that everything is made of atoms.

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