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Selenium trioxide
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<p>Selenium trioxide is the <a href="/facts/Inorganic_compound/TfFfzxSz">inorganic compound</a> with the formula <a href="/facts/Selenium/k975NApC">Se</a><a href="/facts/Oxygen/acyn6o8r">O3</a>. It is white, hygroscopic solid. It is also an <a href="/facts/Oxidizing_agent/1FQzB8pQ">oxidizing agent</a> and a <a href="/facts/Lewis_acid/qlLqRvg2">Lewis acid</a>. It is of academic interest as a precursor to Se(VI) compounds. </p>