jan 4, 400 BC - "Atomos"
Description:
Democritus believed that atoms were small indivisible units that made up all matter. He explained that they differed in size and shape and were always moving.
His theory of atoms was ignored for about 2,000 years.
Added to timeline:
Development and Discovery of Atomic Theory, the Periodic Table, and Radiation
Kelsey West
Date:
