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The basis for which the discovery of molecules was made and that air had more than one gas.
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Plastics and many other chemicals industries wouldn't be possible if it wasn't for the discovery of oxygen.
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In 1789, we learned that Uranium was another element with unique properties and can cause damage to tissues.
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He was the first to call particles atoms. He also found the atomic masses of elements.
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He found that organic chemicals can be synthesized by combining the building blocks in a particular fashion. He then knew everything is building blocks of matter.
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The first spectroscope was invented by the German chemist Robert Wilhelm Bunsen and the German physicist Gustav Robert Kirchhoff.
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They weren't chains of atoms as common thought but more like a snake of atoms. This allowed for so many different formations and bonds to occur, and the registry of 15 million new compounds.
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He placed the elements in a particular order seperating them by periods and groups based on their atomic wait and characteristics.
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Niels Bohr discovered for the first time, subatomic particles.