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Period: 460 BCE to 370 BCE
Democritus
Democritus was an influential Ancient Greek pre-Socratic philosopher primarily remembered today for his atomic theory of the universe. -
Period: 500 to 500
Alchemists
The word alchemist comes from alchemy, which has origins in the Greek word khemeia, meaning "art of transmuting metals." -
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Antoine Lavoisier
French nobleman and chemist central to the 18th-century chemical revolution and had a large influence on both the history of chemistry and the history of biology. -
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John Dalton
John Dalton was an English chemist, physicist, and meteorologist. He is best known for his work in the development of the atomic theory -
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William Crookes
He was a pioneer of vacuum tubes, inventing the Crookes tube which was made in 1875. -
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JJ Thomson
John Thomson was an English physicist. He was elected as a fellow of the Royal Society of London and appointed to the Cavendish Professorship of Experimental Physics -
Period: to
Marie Curie
Polish and naturalized-French physicist and chemist who conducted pioneering research on radioactivity -
Period: to
Robert Andrews Millikan
Robert A. Millikan was an American experimental physicist honored with the Nobel Prize for Physics in 1923 for his measurement of the elementary electronic charge and for his work on the photoelectric effect. -
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Ernest Rutherford
New Zealand physicist who came to be known as the father of nuclear physics. -
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Albert Einstein
He developed the general theory of relativity, one of the two pillars of modern physics. Einstein's work is also known for its influence on the philosophy of science. -
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Niels Bohr
Niels Henrik David Bohr was a Danish physicist who made foundational contributions to understanding atomic structure and quantum theory. -
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Cathode Ray Tube Experiment
The experiment was to show that cathode rays were electrically charged. The cathode ray tube J.J. Thomson demonstrated that cathode rays could be deflected by a magnetic field. -
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Gold Foil Experiment
Rutherford's Gold Foil Experiment proved the existence of a small massive center to atoms, which would later be known as the nucleus of an atom. -
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Millikan Oil Drop Experiment
The oil drop experiment was performed by Robert A. Millikan and Harvey Fletcher in 1909 to measure the elementary electric charge (the charge of the electron). -
Period: to
Electron Cloud Model
It is used to describe where electrons are when they go around the nucleus of an atom. The electron cloud model is different from the older Bohr atomic model by Niels Bohr.