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In 440 BC the idea came up of creating the first ever atom
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The four element theory Earth, Air, Fire & Water was proposed
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Francis Bacon published a book that showed a description of what would later be known as the scientific method.
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Robert Boyle published a book that showed the distinction between chemistry and alchemy.
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Joseph Black isolated carbon dioxide, which he called "fixed air".
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Antoine Lavoisier came up with the firse list of elements containing 33 elements, metals and non metals.
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Henry Cavendish discovered hydrogen, odourless gas that burns and can form an explosive mixture with air.
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"Dalton's Law" was introduced by John Dalton describing the relationship between the components in a mixture of gases.
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In 1828 a table of atomic weights & introduced letters to symbolize elements was devaloped
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John Newlands arranged the elements in order of atomic weights
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William Ramsay discovered the Noble Gases.
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