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Explore the evolution of atomic theory from the ancient ideas of Democritus and Aristotle through the groundbreaking discoveries of Dalton, Thomson, Rutherford, Bohr, and modern cloud theory in the 20th century.
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Atomic Theory Timeline The atomic theory has changed over time as new technologies have become available. • Scientific knowledge builds on past research and experimentation.
Democritus 400 B.C.
Aristotle 300 B.C. to Early 1800’s
Dalton Dalton 1803
Thomson 1897
Rutherford 1908
Bohr 1913
Modern Cloud Theory 20th Century