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Periodic Table History
First attempts to systematizeIn 1789, Antoine Lavoisier published a list of 33 chemical elements. Although Lavoisier grouped the elements in gases, metals, nonmetals, and lands, chemists have spent the next century looking for a more accurate classification system. In 1829, Johann Wolfgang Döbereiner observed that most elements can be grouped into triads (groups of three) depending on their chemical properties. Lithium, sodium and potassium, for example, were grouped together as the soft, reactive metals. Döbereiner also noted that, when arranged...
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