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<p>publishes Lessons on Affinity, in which he demonstrates that the proportions of the "base component" and the "acid component" (<a href="page.php?w=cation">cation</a> and <a href="page.php?w=anion">anion</a> in modern terminology) remain the same during reactions between two neutral <a href="page.php?w=Salt_%28chemistry%29">salts</a>.<br/>
* <b>1789</b>: <a href="page.php?w=Antoine_Lavoisier">Lavoisier</a> publishes Treatise of Elementary Chemistry, introducing the concept of a <a href="page.php?w=chemical_element">chemical element</a> and clarifying</p><p>
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