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Facts About Gold

Gold, like no other metal, has a fascinating history and a special place in the world. For thousands of years it has been used as an ornament of kings, a currency and standard for global currencies, and more recently, in a wide range of electronic devices and medical applications.

Gold's many unique properties have secured it a central role in history and human development. Gold is a remarkable, rare metal, with an unparalleled combination of chemical and physical properties. It is the only yellow metal and bears its name from the Old English word for yellow, 'geolu'. It is also the only metal that forms no oxide film on it's surface in air at normal temperatures, meaning that it will never rust or tarnish.

Gold's chemical symbol, Au, comes from the latin word for gold, aurum. In the Periodic Table of Elements, gold is classified as a transitional metal with the following characteristics;

Symbol: Au
Atomic number: 79
Atomic mass: 196.96655 amu
Number of protons/electrons: 79
Number of neutrons: 118
Melting point: 1,064.43°C (1,337.58°K, 1,947.97°F)
Boiling point: 2,807.0°C (3,80.15°K, 5,084.6°F)
Density @ 293°K: 19.32 grams per cubic centimeter
Crystal structure: cubic

Gold may be alloyed with various other metals to give it special properties. In its pure form, gold has a metallic luster and is sun yellow, but when mixed or alloyed with other metals, such as silver (Ag), copper (Cu), zinc (Zn), nickel (Ni), platinum (Pt), palladium (Pd), tellurium (Te), and iron (Fe), creates various color hues ranging from silver-white to green and orange-red. Usually, red, yellow and green golds are made by adding varying amounts of copper (Cu) and silver (Ag) to produce alloys of 10 to 14 carats. White golds have traditionally been made by alloying nickel (Ni), zinc (Zn) and copper (Cu) with gold, but more recently silver (Ag) and palladium (Pd) have replaced the zinc. These color variation treatments to gold are mostly used in jewelry.

<b>Properties of Gold</b>

An unparalleled combination of chemical and physical properties make gold invaluable to a wide range of everyday applications. One of the most important of these properties is gold’s virtual indestructibility. Gold is the most non-reactive of all metals. It is called a "noble" metal (an alchemistic term) because it does not oxidize under ordinary conditions, meaning that it will never rust and never tarnish. Gold's physical properties of high electrical conductivity and chemical inertness make it an excellent and reliable conductor, particularly in harsh environments, where temperatures can range from -55°C to 200°C. The use of gold in circuitry ensures reliability of equipment operation, particularly in the vital activation of safety airbag mechanisms in motor vehicles or deployment of satellites and spacecraft.No other metal is as ductile or as malleable as gold. A single ounce of the metal can be drawn into a wire five miles long. Gold can be hammered into sheets so thin that light can pass through. High purity gold reflects infrared (heat) energy almost completely, making it ideal for heat and radiation reflection. Gold-coated visors protected astronauts’ eyes from searing sunlight on the Apollo 11 moon landing.

Gold is also an excellent conductor of thermal energy. It is used in many electronic processes to draw heat away from delicate instruments. For example, the main engine nozzle of the space shuttle uses a 35% gold alloy.

<b>Uses of Gold</b>

Gold has been prized by people since the earliest times for making statues and icons and also for jewelry to adorn their bodies. Intricately sculptured art objects and adornment jewelry have been uncovered in the Sumerian royal Tombs in southern Iraq and the tombs of Egyptian kings. Significant buildings and religious temples and statues have been covered with thinly beaten sheets of gold. Due to its rarity, gold has long been considered a symbol of the wealth and power of its possessor.

In 2001, it was estimated that 2870 tons of gold were produced worldwide. About 80 percent of that gold production was used to make jewelry, the majority of which was sold in India, Europe and the United States of America. Gold jewelry is universally popular, loved for its lustrous yellow color and untarnishing character. In many Asian countries, such as India, Thailand, and China, gold is important to religious ceremonies and social occasions, such as the Chinese New Year and Hindu marriages in India.Importantly, gold is still regarded throughout much of the world as a store of financial value, particularly in many developing countries. However it has many other vital uses in modern life.

Each year approximately 660 tons of gold are used in telecommunications, information technology, medical treatments, and various industrial applications. Due to its high electrical conductivity, gold is a vital component of many electrical devices, including computers. It is used in the manufacture of approximately 50 million computers each year, as well as millions of televisions, DVDs, VCRs, video cameras and mobile phones.

Gold has been used in medicine since 1927, when it was found to be useful in the treatment of rheumatoid arthritis. Even before then it was used in dentistry, in fillings and false teeth. Because it is non-toxic and biologically benign, gold is perfect for many medical applications. Surgeons use gold instruments to clear blocked coronary arteries. In another medical procedure, gold pellets are injected into the body to help obstruct the spread of prostate cancer in men. Gold is also used in lasers, which allow surgeons to seal wounds quickly or treat once-inoperable heart conditions. Thin gold wires are used in many surgical procedures to provide strong and inert support.

Contributed By: http://gold.yabz.com/