Jöns Jacob Berzelius (1779–1848) was a prominent Swedish chemist who is often regarded as one of the founders of modern chemistry. He made significant contributions to the field, including the development of a system of chemical notation that is still in use today, which helped to standardize the way chemical compounds and reactions were represented. Berzelius is also known for his work in analytical chemistry and for discovering several chemical elements, including silicon, selenium, and thorium.
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Portrait of Jöns Jacob Berzelius
. Charles W. Sharpe, after Olof Johan Södermark. Public domain (PD-old; Public Domain Mark). Source and usage information on the linked Wikimedia file page. Source.