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450 BCE
Empedocles
Empedocles was Greek philosopher who theorized that there were 5 elements. Fire, Earth, Water, Ether, and Air. -
430 BCE
Democritus
Democritus was also a Greek philosopher who is famous today for creating a Atomic theory. The theory stated that everything is made of atoms. -
350 BCE
Aristotle
Aristotle was one the most famous Greek philosophers exist. When the atomic theory was created he did not believe it and instead taught everyone that everything was made earth, water, fire, and air. It took thousands of years for this to be disproved. -
Period: 350 BCE to
No research was done
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John Dalton
John Dalton was an English chemist. He is famous for proposing the modern atomic theory. Some of the main points of his theory were that elements were made of tiny things called atoms and atoms of the same element are identical. -
JJ Thomson
JJ Thomson was an English Physicist. He is famous for creating the Plum Pudding model which one of the first models of the atom. He is also famous for discovering electrons as negatively charged subatomic particles. -
Albert Einstein
He made the Theory of Relativity, which in turn allowed him to calculate the speed of molecules. -
Niels Bohr
Made a more advanced model of an atom. -
James Chadwick
Discovered the Neutron
