Cambridge Encyclopedia » Cambridge Encyclopedia Vol. 67

selenium

current mainly

Se, element 34. A metalloid in the oxygen group, found as a minor constituent of sulphide ores, and mainly produced from the residue of copper refinement. Its chemistry is similar to that of sulphur, with main oxidation states ?2, +2, +4, and +6. Hydrogen selenide (H2Se) has a particularly obnoxious smell and is very toxic. Mainly important for its electrical properties, selenium can be used to convert light to electric current (in photocells) and alternating current to direct current (in rectifiers).

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