In the following set of axes, the vertical scale is logarithmic (equal scale between powers of 10) and the horizontal scale is linear (even spaces between numbers). There are no negative numbers on the y-axis, since we can only find the logarithm of positive numbers. Semilogarithmic axes.
Mercury (element) is a chemical element with symbol Hg and atomic number 80. It is commonly known as quicksilver and was formerly named hydrargyrum (/haÉªËdrÉrdÊÉrÉm/). On the periodic table of elements, the chemical symbol for mercury is Hg, from the Latin word-Hydrargyrum-meaning liquid silver. 2  For quite some time, we have known that high concentrations of mercury can be toxic to humans; the first account of mercury poisoning was recorded as early as 50 B.C.
Mercury occurs naturally in the environment and exists in a large number of forms. Like lead or cadmium, mercury is a constituent element of the earth, a heavy metal.In pure form, it is known alternatively as elemental or metallic mercury (also expressed as Hg(0) or Hg 0).Mercury is rarely found in nature as the pure, liquid metal, but rather within compounds and inorganic salts.lemental mercury is a shiny, silver-white metal that is a liquid at room temperature and is traditionally used in thermometers and some electrical switches. If not enclosed, at room temperature some of the metallic mercury will evaporate and form mercury vapours.