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First Record of Atom Discovery 300-400 BC

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First Record of Atom Discovery 300-400 BC

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In ancient Greece two philosophers Democritus and Leucippus created a theory that matter was not divisible into smaller particles but was actually made up by indivisible particles called atoms

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An englishman by the name of Joseph Priestley discovered oxygen gas among other things and made many advances in chemistry and atomic sciences

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Law of conservation mass late late 1700s 

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Law of conservation mass late late 1700s 

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Regarded as the "father of modern chemistry", Antoine Lavoisier was a french chemist who famously discovered the law of conservation mass. This declared that in any chemical reaction, the mass of the substances that react equals the mass of the products that are formed.

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John Dalton's atomic theory of matter 1800s

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John Dalton's atomic theory of matter 1800s

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English schoolteacher John Dalton used the findings of many other chemists to suggest that elements consisted of invisible particles he called the atoms. He created an atomic theory of matter that is the basis for atomic sciences today.

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French chemist Joseph Gay-Lussac did a number of experiments with different gases and found that some reacted together to form chemical compounds which was the gateway to many chemical and atomic discoveries

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https://2012books.lardbucket.org/books/principles-of-general-chemistry-v1.0/s05-04-a-brief-history-of-chemistry.html