Selenide
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A selenide is a chemical compound containing a selenium anion with oxidation number of −2 (Se), much as sulfur does in a sulfide. The chemistry of the selenides and sulfides is similar. Similar to sulfide, in aqueous solution, the selenide ion, Se, is prevalent only in very basic conditions. In neutral conditions, hydrogen selenide ion, HSe, is most common. In acid conditions, hydrogen selenide, H2Se, is formed.