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German merchant and amateur alchemist Hennig Brand attempted to make an object that could supposedly make metals into pure gold
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Robert Boyle also discovered phosphorus, and it became public
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At least 47 elements were discovered and scientists began to see patterns in the characteristics
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English chemist John Newlands divided the than discovered 56 elements into 11 groups, based on characteristics.
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Russian chemist Dimitri Mendeleev starrted the development if the periodic tables arranging chemical elements by atomic mass
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French physicist Antoine Bequerel first discovered radioactivity.
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Sir William Ramsay and Lord Rayleigh discovered the noble gases, which were added to the periodic table as group 0.
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English physicist J. J. Thomson first discovered electrons.
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Bequerel discovered that electrons and beta particles as identified by the Curies are the same thing.
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Rutherford announced that radioactivity is caused by the breakdown of atoms.
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Rutherford and German physicist Hans Geiger discovered that electrons orbit the nucleus of an atom.
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Bohr discovered that electrons move around a nucleus in discrete energy called orbitals.
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Rutherford first identified protons in the atomic nucleus. He also transmutated a nitrogen atom into an oxygen atom for the first time.
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James Chadwick first discovered neutrons, and isotopes were identified.
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Glenn Seaborg identified lanthanides and actinides which are usually placed below the periodic table