Mercury(i) chloride (also called calomel) is sometimes still used in medicine and acousto-optical filtersmercury(ii) chloride (which is very corrosive, sublimates and is a violent poison)mercury fulminate, (a detonator widely used in explosives)mercury(ii) oxide, the main oxide of mercurymercury(ii) sulfide (cinnabar mercuric ore still used in oriental medicine, or vermilion which is a high-grade paint pigment)mercury(ii) selenide a semiconductormercury(ii) telluride a semiconductormercury cadmium telluride and mercury zinc telluride, infrared detector materialslaboratory tests have found that an electrical discharge causes the noble gases to combine with mercury vapor. These compounds are held together with van der waals forces and result in hgne, hgar, hgkr, and hgxe. Organic mercury compounds are also important. Methylmercury is a dangerous compound that is widely found as a pollutant in water bodies and streams.Laboratory usessome medical thermometers, especially those for high temperatures, are filled with mercury; however, they are gradually disappearing. In the united states, non-prescription sale of mercury fever thermometers has been banned since 2003.[51] mercury is also found in liquid mirror telescopes. Some transit telescopes use a basin of mercury to form a flat and absolutely horizontal mirror, useful in determining an absolute vertical or perpendicular reference. Concave horizontal parabolic mirrors may be formed by rotating liquid mercury on a disk, the parabolic form of the liquid thus formed reflecting and focusing incident light. Such telescopes are cheaper than conventional large mirror telescopes by up to a factor of 100, but the mirror cannot be tilted and always points straight up.[52][53][54] liquid mercury is a part of popular secondary reference electrode (called the calomel electrode) in electrochemistry as an alternative to the standard hydrogen electrode. The calo
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