How were elements identified in the late 18th century?

Elements were identified in the late 18th century by chemists through various methods such as isolating them from compounds, observing their unique properties, and conducting chemical reactions to understand their behavior. Notable figures during this period, like Antoine Lavoisier, made significant contributions to the understanding and classification of elements. The development of the Periodic Table in the 19th century further organized and systematized our knowledge of elements.