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Robert Boyle discovered phosphorus
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Henry Cavendish discovered hydrogen as a colorless odorless gas
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In 1789, Antoine Lavoisier grouped the elements based on their properties into gases, non-metals, metals and earths.
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In 1829, Johann Döbereiner recognized triads of elements with similar properties he showed that the properties of the middle element could be predicted from the properties of the other two.
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John Newland arranged the elements in order of atomic weights and observed similarities between some elements
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Dmitri Mendeleev made a periodic table that was arranged by the atomic mass and arranged periodically with elements similar with similar properties under each other
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William Ramsay discovered the noble gases
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J.J Thompson discovered neutrons