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same method as Gay-Lussac (reducing potassium fluorosilicate with molten potassium metal), but purifying the product to a brown powder by repeatedly washing it. As a result, he is usually given credit for the element's discovery. The same year, Berzelius became the first to prepare silicon tetrachloride (SiCl₄); silicon tetrafluoride had already been prepared long before in 1771 by Carl Wilhelm Scheele

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