Gold

Article

May 19, 2022

Gold (Au, lat. Aurum) is a chemical element. Gold is thick, soft, shiny, forged and light yellow metal. It is the chemical element of the symbol Au (Aurum in Latin, which means the glow of dawn) and the atomic number 79 in the periodic table of chemical elements. In its purest form, it is light, slightly reddish yellow, thick, soft, wrought, and stretchy metal. Chemically, gold is a transition metal and an element of group 11. It is one of the least reactive chemical elements and is solid under standard conditions. Gold often occurs in free elemental form, as lumps or grains, in rocks, in wires, and in alluvial deposits. It occurs in series of solid solutions with the natural element silver (as electrum) and also naturally leginosa with copper and palladium. In rare cases, it occurs in minerals in the form of gold compounds, usually with tellurium (gold tellurides). The atomic number of gold is 79, which makes it one of the heavier natural elements. It is thought to have originated in the supersynthesis of supernovae, from collisions of neutron stars, and to have been present in the dust from which the solar system was formed. Since the Earth was melted when it was formed, almost all the gold gold present in the early Earth probably sank into the planetary core. Therefore, it is believed that most of the gold present today in the Earth's crust and mantle reached Earth later, by asteroid impact during the Late Heavy Bombing, about 4 billion years ago. Gold is resistant to most acids, although it dissolves in the imperial water, a mixture of nitric acid and hydrochloric acid, thus forming a soluble tetrachloroaurate anion. Gold is insoluble in nitric acid, which dissolves silver and base metals. This property has long been used to refine gold and confirm the presence of gold in metal objects, whence the term acid test. Gold is also soluble in alkaline cyanide solutions, which is used in mining and electroplating. Gold dissolves in mercury, forming amalgam alloys, although it is not a chemical reaction. Representation Gold is represented in the earth's crust in the amount of 1.1 × 10−3 ppm (parts per million). It is almost regularly in a pure elemental state in the form of grains or leaves within the square