A selenide is a chemical compound containing a selenium anion with oxidation number of −2 (Se2−), 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, Se2−, 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.
Some selenides are reactive to oxidation by air. Owing to the greater reducing power of selenide, metal selenides are more easily decomposed to the elements than are sulfides (tellurides are even more labile). Selenides of electropositive metals: such as aluminium selenide readily hydrolyse, even in moist air, evolving toxic hydrogen selenide gas.
Pure selenide minerals are rare, instead selenium tends to partially substitute for sulfide in many sulfide minerals. The degree of substitution is only of commercial interest for copper sulfide ores, in which case selenium is recovered as a by-product of copper refining. Some selenide minerals include ferroselite and umangite.
Postcode district boundaries: Bing / Google
The SE (South Eastern) postcode area, also known as the London SE postcode area, is the part of the London post town covering part of south-east London, England. It loosely corresponds to the London Borough of Southwark, London Borough of Lewisham and Royal Borough of Greenwich, the northern part of the London Borough of Croydon, the eastern part of the London Borough of Lambeth, the western part of the London Borough of Bexley and the northwestern part of the London Borough of Bromley.
The postcode area originated in 1857 as the SE district. In 1868 it gained some of the area of the abolished S district, with the rest going to SW. It was divided into numbered districts in 1917, by giving the district closest to London and the location of the head office the suffix "1" and then each district assigned a number alphabetically based on the location of the main office within the district. SE28 is a much later addition carved out of the existing districts SE2 and SE18 in order to accommodate the development of Thamesmead. Unlike in the SW postcode area, where districts are also split into two alphabetical tranches, SE1 is the only head district, and although the numbering begins again at SE19 this is not a head district. The postcode area is part of the London post town. There are no dependent localities used in the postcode area. SE1P is a non-geographic postcode district for PO boxes located in SE1.
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