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Period: to
The invention of the Volta Pile
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The discovery of Oxygen
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Davy: employed by Royal Institution
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Discovery of Sodium and Potassium
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Fraunhofer lines discovered
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Invention of the spectroscope
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The discovery of Caesium
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Periodic Law (Mendeleev)
Mendeleev starts forming the periodic table by listing elements according to their atomic weight -
60 elements had been discovered.
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Period: to
Rayleigh's work with gases
Rayleigh begins to conduct experiments in order to find the accurate densities of various gases by simplifying them into their pure form