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Features of gold

There are no other metal or metal scales even gold

Gold's beauty, value and many unique qualities make it the material of choice in many industries. Most of the gold—78 percent of the annual gold supply—is made into jewelry. Other industries, mostly electronics, medicine, and dentistry, require about 12 percent. The remaining 10 percent of the annual gold supply is used for financial transactions.

Gold is used as a contact metal in the electronics industry because it is a good conductor of both electricity and heat.

The word "gold" probably originated from the Indo-European word "gel", which means "yellow". The chemical symbol for gold, Au, is short for the Latin word for gold, aurum, which means "glowing dawn."

Gold conducts heat and electricity. Copper and silver are the best conductors, but gold connectors are long-lasting for both because they don't fade. Not that gold lasts longer, but that it remains conductive for longer.

Gold is ductile: it can be mined into the thinnest wire. One ounce of gold can be drawn into 80 kilometers (50 miles) of thin gold wire, five microns thick, or five millionths of a meter. This specimen is 0.20 millimeters (0.008 in) in diameter.

Gold is a great reflector of heat and light. The astronauts' space helmet visors receive a coating of gold so thin (0.00005 mm, or 0.000002 in) that it is partially transparent. Astronauts can see through it, but even at this thinness, the gold film reduces glare and heat from sunlight.

Gold is highly valued for its beauty. Jewelers and metalsmiths prize it as a metal that can be engraved, hammered, cast, stretched, or rolled.

Gold is malleable, so it can be flattened into very thin sheets. The walls of the Gold Chamber are covered with approximately 28 square meters (300 sq ft) of 23 karat gold leaf which represents 3 ounces of gold metal. Gold leaf - also known as gilding - is an ancient technique. Traditional artisans would strike raw gold between pieces of leather until it was too thin to see through. One ounce of gold can be struck with enough flakes to cover more than 9 square meters (96.9 square feet) of surface. The thickness of gold leaf may not exceed 0.18 microns (seven millionths of an inch); A stack of 7055 sheets of paper will never be thicker than a dime.



In nugget, gold is a yellow metal, although it may be black, sapphire, or purple when finely divided. Gold is a good conductor of electricity and heat. Unaffected by exposure to air or most reagents. It is inert and a good infrared reflector. Gold alloys are usually made to increase their strength. Pure gold is measured by troy weight, but when gold is alloyed with other metals, the term karat is used to express the amount of gold present.

Common uses of gold

Gold is used in currencies and is the standard for many monetary systems. It is used for jewelry, dental work, paint, and reflectors. Chlororic acid (HAuCl4) is used in photography for toning silver photos. Disodium aurothiomalate, given by intramuscular injection, is a treatment for arthritis.

Where there is gold

Gold is found as a free metal and in telluride. It is widely distributed and almost always associated with pyrite or quartz. Gold is found in veins and placer deposits. Gold is present in seawater in an amount ranging from 0.1 to 2 mg/t, depending on the location of the sample.

gold trifles

Gold is one of the few elements that can be found in its original state.

Gold is the most malleable and malleable metal. One ounce of gold can be struck up to 300 square feet or stretched into a wire 2,000 kilometers long (1 micrometer thick).

The melting point of gold is a custom value, which serves as the calibration point for the international temperature scale and the international practical temperature scale.

The gold ion in the +1 oxidation state (Au(I)+) is called the auroral ion.

The gold ion in the +3 oxidation state (Au (III) 3+) is called the auric ion.

Compounds containing gold in the -1 oxidation state are called orides. (Cesium and rubidium can form oride compounds)

Gold is one of the noble metals. Noble metal is a chemical term for metals that do not corrode under normal conditions.

Gold is the seventh most dense metal.

Metallic gold has no smell or taste.

Gold has been used as jewelry since prehistoric times. Today, gold in jewelry is not "pure" gold. Gold jewelry is made from many different gold alloys.

Gold resists most acids. Aqua regia is used to dissolve gold.

Elemental gold is considered non-toxic and is sometimes used as a food additive.

Turning lead into gold was one of the main goals of alchemists. Modern nuclear chemists have found ways to accomplish this historic task.