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The first organization of the elements was published by Antoine Lavoisier in 1789 . The published a list of 33 chemical elements grouped into gases, metals, nonmetals and earths. Among elements that we recongize such as oxygen and zinc, Lavoisier also included light and caloric, which he believed to be material substances.
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This concept became known as valency.
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This table revealed that elements with similiar properties often shared the same valency.
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The discovery of gallium corresponded exactly to a value Mendeleev had assigned to a gap in his table directly below Aluminum. This helped prove Mendeleev's table.
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This filled a gap between Calcium and Titanium in Mendeleev's table.
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The discovery of the noble gases upset Mendeleev's table because he had not accounted for a complete column missing from his table.
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Atomic number was discovered through the use of X-Rays and the table was reorganized by atomic number.
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Mendelevium was named after Dmitri Mendeleev.