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It was discovered by Joseph Priestly in the 1770's. This element is what mostly make up the rest of the other elements on the periodic table.
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Dalton first discovered the atomic theory and it determined the atomic weight and the relationship between atoms.
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Humphry Davy performed an experiment where he melted pot ash and the put wires. Potassium was the outcome when reacting to chemicals.
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Discovered by Avogadro, he concluded that gases are made by molecules and not just atoms.
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Stating that the building block of all matter of both organic and inorganic aren't different.
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Elements were arranged by atomic number, electron configurations, and similar properties.
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The structure was found by August Kekule. He found out how molecules can form bonds.
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Antonie Becquerel discovered how Uranium was the main source of causing radioactivity.
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To identify the elements, they use heat because not every element has the same color.
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J. J. Thomson discovered how an atom can have a negative charge, and not just a positive charge.