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400
Aristotle
Said that atoms were made of earth, air, fire, and water. 400 bc. -
413
Democritus
In 413 BC he proposed that all things were made of small partcles that couldn't be broken down. He called them atomas meaning "uncutable". His atom was just a round sphere. -
Antoine Lavoisier
Made the law of conservation of matter. this law states that matter cannot be either created or destroyed. -
Joseph Louis Proust
Proved the law of definate proportions. This helped Dalton to make his law of multiple proportions. -
John Dalton
He made an atomic theory that outlined atomic theory. He also drew atoms and molecules. -
Michael Faraday
He invented electrolysis as a splitting of molecules. -
Marie and Piere Curie
They discovered radium and that gave other scientists radiation to test. -
Henri Becquerel
He worked with marie and pierre curie. -
J. J. Thomson
He discovered the electron by observing that a beam was deflected by electricity. -
Max Planck
Said that energy isn't in continued streams but small particles. -
Ernest Rutherford
He proved atoms in his experiment with gold foil. -
Albert einstein
His paper on brownian motion confirmed the atomic theory of matter. -
Robert Millikan
He proved subatomic particles. -
Niels Bohr
He discovered that electrons travel in orbits around the neucleus. then he drew a new atom model. -
James Chadwick
Descovered the neutron.
