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400 BCE
Democritus adopts atomic theory
His mentor, Leucippus came up with the model first. His model was simply a round sphere -
370 BCE
Democritus's death
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Dalton finds out about the atomic theory
Dalton's fascination with gases gradually led him to formally assert that every form of matter (whether solid, liquid or gas) was also made up of small individual particles. -
Dalton's death
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Thomson adopts atmoic theory
He demonstrated that cathode rays were negatively charged. -
Rutherford adopts atomic theory
He demonstrated that the atom had a tiny heavy nucleus -
Bohr adopts atomic model
Depicts the atom as a small positively charged nucleus surrounded by electrons that travel in circular orbits around the nucleus. -
Rutherford's death
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Thompson's death
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Bohr's death