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Hg is the modern chemical symbol for mercury. [28] It is an abbreviation of hydrargyrum, a romanized form of the ancient Greek name for mercury, ὑδράργυρος (hydrargyros). Hydrargyros is a Greek compound word meaning ' water-silver ', from ὑδρ - (hydr-), the root of ὕδωρ (hydor) ' water ', and ἄργυρος (argyros ...
For some elements, this is because the material was known in ancient times, while for others, the name is a more recent invention. For example, Pb is the symbol for lead (plumbum in Latin); Hg is the symbol for mercury (hydrargyrum in Greek); and He is the symbol for helium (a Neo-Latin name) because helium was not known in ancient Roman times.
118 chemical elements have been identified and named officially by IUPAC.A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z).
The elements of group 12 have an oxidation state of +2 in which the ions have the rather stable d 10 electronic configuration, with a full sub-shell. However, mercury can easily be reduced to the +1 oxidation state; usually, as in the ion Hg 2+ 2, two mercury(I) ions come together to form a metal-metal bond and a diamagnetic species. [24]
Hg is the symbol of chemical element mercury (from its Latin name hydrargyrum). Hg, hg, HG, inHg or "Hg may also refer to: Arts and media. H. G. Wells, English writer;
Mercury barometer. A millimetre of mercury is a manometric unit of pressure, formerly defined as the extra pressure generated by a column of mercury one millimetre high, and currently defined as exactly 133.322 387 415 pascals [1] or approximately 133.322 pascals. [2]
Hg 2 Cl 2 → HgCl 2 + Hg. The formation of Hg can be used to calculate the number of photons in the light beam, by the technique of actinometry. By utilizing a light reaction in the presence of mercury(II) chloride and ammonium oxalate, mercury(I) chloride, ammonium chloride and carbon dioxide are produced. 2 HgCl 2 + (NH 4) 2 C 2 O 4 Hg 2 Cl ...
Hg 2+ 2 is stable in aqueous solution, where it is in equilibrium with Hg 2+ and elemental Hg, with Hg 2+ present at around 0.6%. Anions of insoluble salts readily shift the equilibrium: S 2−, which forms an insoluble Hg(II) salt, induces complete disproportionation, whereas Cl −, which forms an insoluble Hg(I) salt, induces the reverse. [3]