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Gold is a chemical element with the symbol Au and atomic number 79 and is one of the elements with high atomic number that exists in nature. Pure gold is a shiny, reddish-yellow metal, dense, soft, malleable and flexible.
Gold is the chemical element of a transitional metal and member of group 11. This substance is one of the chemical elements with the least reactivity Which is solid under normal conditions. Gold metal is often present in the form of free element in the form of metal fragments or grains in rocks, veins and alluvial deposits. It is present in a series of solid solutions with the element silver (electrom) and also alloys naturally with copper and palladium.
When Spanish explorers first arrived in the New World, they met with Native Americans The two cultures were separated by a wide ocean They had never met . They spoke different languages and they had no different life However , they had one thing in common , they respected gold and used it to make some of the most important things. Very high luster, optimal yellow color, rust resistance, optimal malleability are all characteristics of an attractive metal. which is easily applied to beautiful objects Another very important factor that requires the use of gold as a jewelry metal is the tradition that expects important objects to be made of gold.
Gold is resistant to most acids, although it dissolves in aqua regia (a mixture of nitric acid and hydrochloric acid). It does not dissolve in nitric acid, which dissolves most metals, including silver This property has long been used to refine gold and confirm the presence of this metal in metal objects And is known as the acid test. It also dissolves in alkaline cyanide solutions used in mining and plating Gold is dissolved in mercury . And forms amalgam alloys but this is not a chemical reaction . Gold is the most flexible of all metals, which can be threaded into a wire at a width of one atom and then stretched considerably before breaking. These nanowires can be significantly distorted in the process of forming, reshaping, transmitting and moving without hardening. One gram of gold can be converted into a sheet of 1 square meter Gold sheets can be thin enough Until it becomes translucent, the light transmitted in this state appears greenish blue Because it reflects the intensity of red and red .
Since gold is very limited in its value, it has long been used as a medium of exchange or money . The first known use of this metal in transactions dates back to more than 6,000 years . Early dealings were carried out using pieces of gold or pieces of silver . The rarity, usefulness and desirability make this metal a valuable material for a long time It is also shared with durability , portable and easy to be shared . Today, gold coins are no longer widely used for financial transactions . However, coins produced in certain weights are a common way that people can buy and hold small amounts of the metal for investment.
The most important industrial use of this metal is to make electronics . Electronic devices operate with very low voltages and currents that are easily interrupted by corrosion or staining at the contact points. Gold is a very efficient conductor that can withstand these tiny currents and protect against corrosion. Electronic components made of this metal are highly reliable and are used in connectors, switch fittings, solder joints, connecting wires and connecting strips. A small amount of this metal is used in almost every advanced electronics device . These devices include cell phones, calculators, personal digital devices, Global Positioning System (GPS) units and other small electronic devices. Most of the big electronic devices , such as television , also contain this metal .
In many places , desktop or laptop computers are used in this metal . Fast and accurate transfer of digital information through a computer from one component to another requires an efficient and reliable conductor . The importance of high quality and reliable performance justifies the high cost. The edge connectors used to install the microprocessor and memory chips to the motherboard and the plug and socket connectors used to connect the cables all contain this metal. Gold in these components is generally plated on other metals and alloyed with small amounts of nickel or cobalt to make it more durable.
It is used in dentistry because of excellent performance and aesthetic appeal And its alloys are used for fillings, crowns, bridges and orthodontic appliances . This metal is chemically inert and non-allergenic and is easy for the dentist to work with.
This metal is used as a medicine to treat a small number of medical problems . Injections of weak solutions of arotiumlate sodium or arthritoglucose are sometimes used to treat rheumatoid arthritis. In addition, radioactive gold isotope particles are implanted in tissues to act as a radiation source in the treatment of certain cancers. Many surgical instruments, electronic equipment, and life support devices are made using small amounts of this metal. Gold is non-reactive and is very reliable in electronic equipment and life support devices.
Gold is the best option if you want to spend billions of dollars on a vehicle that does not require lubrication, maintenance and repair when starting and traveling This is exactly why the metal is used in hundreds of ways in every space vehicle launched by NASA. Many parts of each spacecraft have gold-plated polyester film . The film reflects infrared radiation and helps stabilize the spacecraft's temperature . Without this coating, the dark parts of the spacecraft will absorb significant amounts of heat.
Most applications of this metal today have only been developed in the last two or three decades . As our society needs more advanced and safer materials, our use of gold increases. This growing demand, low number of alternatives and limited supply causes the value and importance of gold to increase gradually and steadily.
Ahan Pouya with more than a decade of best-selling experience, adheres to professional and ethical principles in the field of selling and buying at inside and outside the borders of Iran, helping you in the steel industry.
