Selenium is a chemical element (Se) used in electronics, glassmaking, and nutrition. It is a nonmetal with metalloid properties, essential in trace amounts for human health, and known for its role in antioxidants. In biology, it also appears in proteins as the amino acid selenocysteine. The term also refers to a web testing framework in software development, though the element is the more common usage.
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0:58Rubidium
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1:00Ruthenium
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0:55Salt
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0:59Scandium
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1:00Selenium
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0:58Solute
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1:07Stoichiometry
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0:59Strontium
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0:57Sulfur
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0:57Tantalum
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