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In the late 1700s, FRench scientist Antoine Lavoisier (1743-1794) complied a list of all the elements that were known at the time
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The 1800s brought a large increase in the number of shown elements
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(1830-1895)Lothar Meyer demonstrated a connection between atomic mass and element properties and he also arranged the elements in order of increasing atomic numbers
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(1834-1907) Dmitri Mendeleev predicted the existence and properties of undiscovered elements
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(1837-1895) John Newlands arranged elements by increasing atomic mass and created the law of Octaves
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(1887-1915) Henry Mosely discovered that atoms contains a unique number of protons called the atomic number & arranged then in increasing atomic numbers
