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Oxygen was discovered in the 1700s. It existed in a tube that was heated and placed over liquid.
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Atomic theory was discovered by John Dalton as he identified similarities between a few elements and found their atomic weights. He also used atoms to strategize.
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In 1811, molecules were discovered. This opened a new world for chemists to begin experimenting with individual atoms and combining atoms.
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The formation of urea was discovered. It was not made from a living being. It was crystallized.
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It was found that plastics can mold and have strength, which was a very beneficial discovery.
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Mendeleev discovered the periodic table of elements. He laid element cards on a table and organized them based on known information about the elements.
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Scientists experimented for decades and found uranium was radioactive. There is great risk when working with radioactive materials.
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Joseph Thompson performed an experiment and found that atoms contain electrons. They were originally called subatomic particles but are now called electrons.
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Lewis discovered that electrons form chemical bonds. He experimented with valence electrons, which ultimately led to bonds and forming compounds.
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Fullerenes were discovered by three scientists. Those scientists went on to win Nobel prizes for finding new molecules.
