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Monday, April 11, 2011

Gold

Au

Heat, moisture, oxygen, and most corrosive agents have very little chemical effect on gold, making it well-suited for use in coins and jewelry. Heat, humidity, oxygen, and most corrosive agents have very little chemical effect on gold, making it suitable for use in coins and jewelry.

The History Says History Says
Gold is mentioned installments times in the Old Testament. Gold is mentioned several times in the Old Testament. The south-east corner of the Black Sea was famed for its gold. The south-east corner of the Black Sea known for its gold. Exploitation is said to date from the time of Midas, and this gold was Important in the establishment of what is probably the world's Earliest coinage in Lydia Between 643 and 630 BC. Exploitation is said to date from the time of Midas, and this gold was important in the formation of what may be the world's first coins in Lydia between 643 and 630 BC.

The Present Scenario Present Scenario
The gold isotope Au-198, is Used in Some cancer treatments and for Treating other diseases. Gold isotope Au-198, used in some treatments to treat cancer and other diseases.

Gold is a metallic element. Gold is a metal element. Its atomic number is 79. is the atomic number 79. It is soft, shiny, yellow, dense, malleable and ductile. It is soft, shiny, yellow, dense, malleable and ductile. It does not REACT with most chemicals but is attacked by chlorine, fluorine and aqua regia. He does not react with most chemicals but is attacked by chlorine, fluorine and aqua regia. This metal occurs in the form of nuggets or grains in rocks. These metals occur in the form of nuggets or grains in rocks. It is is Also found in alluvial deposits. It is also found in alluvial deposits.

Gold is measured by troy weight and by grams. Gold is measured by troy weight and grams. If alloyed with other metals, a term 'Carat' or 'rust' is Used to indicate the amount of gold present. If alloys with other metals, rust 'term' or 'rust' is used to indicate the amount of gold present. Pure gold is 24 carats. Pure gold is 24 carat.

Physical Properties of Gold Gold Physical Properties
Solid phase Solid Phase
Density (near room temperature) Density (near room temperature) 3.19 g/cm3 3.19 g/cm3
Liquid density at melting point Liquid density at melting point of 17.31 g/cm3 g/cm3 17:31
Melting point Melting point 1337.33 K (1064.18 ° C, 1947.52 ° F) 1337.33 K (1064.18 ° C, 1947.52 ° F)
Boiling point Boiling point 3129 K (2856 ° C, 5173 ° F) 3129 K (2856 ° C, 5173 ° F)
Heat of fusion Heat of fusion 12:55 kJ / mol 12.55 kJ / mol
Heat of vaporization Heat of vaporization 324 kJ / mol 324 kJ / mol
Heat capacity The heat capacity (25 ° C) 25 418 J / (mol-K) (25 ° C) 25.418 J / (mol-K)

Atomic Properties of Gold Atomic Gold Properties
Crystal structure Crystal structure Cubic Face Centered Cubic face-centered
Oxidation states oxidation state 3, 1 (amphoteric oxide) 3, 1 (amphoteric oxide)
2:54 Electronegativity Electronegativity (Pauling scale) 2.54 (scale Pauling)
Ionization Energy Ionization energies 1st: 890.1 kJ / mol 1st: 890.1 kJ / mol
2nd: 1980 kJ / mol 2nd: 1980 kJ / mol
Atomic radius atomic radius 135 pm 135 pm
Atomic radius (calc.) Atomic radius (calc.) 174 pm 174 pm
Covalent radius of 144 pm Covalent radius 144 pm
Van der Waals radius Van der Waals radius of 166 pm 166 pm

Characteristics of Gold Gold Characteristics
Gold is yellow in color but cans Also occur in black or ruby ​​Pls it is finely divided. Yellow gold but can also occur in black or ruby ​​when finely divided. The colloidal solutions are intensely colored and are Often purple. Colloidal solutions are intensely colored and often purple. Gold's plasmon frequency, lying in the visible range, results in colors. Gold plasmon frequency, lying in the visible range, resulting in color. It absorbs blue light and causes the red and yellow light to be reflected. It absorbs blue light and causing the red and yellow light will be reflected.

Gold is most malleable and ductile. Gold is most malleable and ductile. One gram cans be beaten into a sheet of one square meter. One gram can be beaten into sheets one square meter. It readily forms alloys with many other metals. It's easy to form alloys with other metals. With copper it yields redder metal, iron with blue, green produces silver, aluminum and platinum-purple-white. With copper it produces the red metal, iron blue, green produce silver, aluminum and platinum-purple-white. Generally Native gold contains 8-10% silver. Native gold contains usually 8-10% silver.

Gold is a good conductor of both heat and electricity. Gold is a good conductor of both heat and electricity. It is not affected by water and most Regents. It is not affected by air and most regents. Heat, moisture, oxygen, and most of the corrosive agents have very little chemical effect on gold. Heat, humidity, oxygen, and most corrosive agents have very little chemical effect on gold. Halogens chemically alters gold and aqua regia dissolves it. Halogen chemistry change and aqua regia dissolves gold.

Uses of Gold Gold Use

* Gold and its ally are Often used in jewelry, coinage and a standard for monetary exchange in many countries. Gold and its allies are often used in jewelry, currency and standard for monetary exchange in many countries.
* Due to its high electrical conductivity and resistance to corrosion, it is Used as industrial metal. Because of high electrical conductivity and resistance to corrosion, is used as an industrial metal.
* It is made into thread and Used in embroidery. This is made into yarn and used in embroidery.
* It performs a critical functions in computers, communications equipment, Spacecraft, aircraft jet engines and host of other products. This perform important functions in computers, communications equipment, spacecraft, jet engines and a host of other products.
* The resistance to oxidation properties, it is Used as a thin layers electroplated on the surface of electrical connectors to make sure of good connection. The resistance to oxidation properties, used as a thin layer coated on the surface of electrical connectors to ensure a good connection.
* It is Used in restorative dentistry. It is used in restorative dentistry.
* Colloidal gold (a gold nanoparticle) is an intensely colored solution and is Used as gold paint on ceramics prior to firing. Colloidal gold (a gold nanoparticle) is an intensely colored solution and used as gold paint on ceramics prior to firing.
* Chlorauric acid is Used in photography to tone silver image. Chlorauric acid is used in photography for the silver image tone.
* Gold (III) chloride is utilised as catalyst in organic chemistry. Gold (III) chloride used as catalyst in organic chemistry.
* It is Used in awards. It is used in the award.
* It is Used for protective coatings on many artificial satellites as it is a good reflector of infrared and visible light. It is used for protective coating on many artificial satellites because it is a good reflector of infrared and visible light.
* The isotope of gold, Au-198 is Used in Some cancer treatments and for other diseases. Gold isotope, Au-198 is used in some treatment of cancer and other diseases.
* Gold flake is Used in sweets and drinks. Flakes of gold used in candy and drinks.
* White gold serves as the substitute for platinum. white gold serves as a substitute for platinum.
* Green Gold is Used in specialized jewelry. Green gold is used in specialized jewelry.

World Gold World Gold Market Markets

* London as the great clearing house in London as a major clearinghouse
* New York as the home of futures trading in New York as a futures trading house
* Zurich as a physical Zurich as a physical turntable turntable
* Istanbul, Dubai, Singapore and Hong Kong as doorways to Important consuming regions. Istanbul, Dubai, Singapore and Hong Kong as the gateway to important consuming regions.
* Tokyo Nowhere TOCOM sets the mood of Japan in Tokyo where Japan's TOCOM sets the atmosphere
* Mumbai under India's liberalized gold regime under the regime of liberalization of Mumbai's golden India

Gold producing Major Major Gold Producing Countries Countries

* South Africa South Africa
* United States United States
* Australia Australia
* China China
* Canada Canada
* Russia Russia
* Indonesia Indonesia
* Peru Peru
* Uzbekistan Uzbekistan
* Papua New Guinea Papua New Guinea
* Ghana Ghana
* Brazil Brazil
* Chile Chile
* Philippines Philippines
* Mali Mali
* Mexico Mexico
* Argentina Argentina
* Kyrgyzstan Kyrgyzstan
* Zimbabwe Zimbabwe
* Colombia Colombia

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