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Mercury is also called mercury. Mercury is a chemical element. The element symbol is Hg at the 80th position in the periodic table of the elements. It is located in the sixth period and group IIB in the periodic table of chemical elements. It is the only metal that exists as a liquid and flows easily under normal temperature and pressure. , Mercury is a silvery white shiny heavy liquid with stable chemical properties, insoluble in acids and alkalis. Mercury can evaporate at room temperature. Mercury vapor and mercury compounds are highly toxic (chronic). Mercury has strong cohesion and is stable in the air. At room temperature, mercury vapor evaporates with a specific gravity of 6.9, which is highly toxic. Mercury has a long history of use and has a wide range of uses. In medieval alchemy, it was called the three sacred elements of alchemy together with sulfur and salt.